Clinical Biomechanics / Amit Gefen
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Paru le : 01/12/2018
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Ajouter le résultat dans votre panierBiomechanical evaluation of the first ray in pre-/post-operative hallux valgus: A comparative study / Junchao Guo in Clinical Biomechanics, Vol. 60 (December 2018)
Titre : Biomechanical evaluation of the first ray in pre-/post-operative hallux valgus: A comparative study Type de document : Article Auteurs : Junchao Guo ; Lizhen Wang ; Rui Mao ; [et al.] Article en page(s) : p. 1-8 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.06.002 Langues : Anglais (eng) Descripteurs : HE Vinci
Biomécanique ; Etude comparativeMots-clés : Hallux Valgus Ostéotomie distale Instabilité de l'articulation Résumé : Background
Deformity of the first ray in hallux valgus patient has been deemed to mainly contribute to instability of the metatarsophalangeal joint. However, it is not clear whether the fixation of the distal osteotomy fragment and transposition of the sesamoid represent the best method for hallux valgus treatment. The aim of this study was to examine how postoperative hallux valgus osteotomy affects the stability of the first ray.
Methods
To accurately investigate the biomechanical behavior of the first ray in pre-/postoperative hallux valgus patients, we described the relative displacement and stress distribution of the first metatarsal bone and sesamoid by imageology, test measurement and foot finite element model.
Findings
Compared with the preoperative hallux valgus, the plantar pressure decreased by 47.8% and was redistributed on second metatarsal region. The peak stress and relative displacement of the distal osteotomy fragment increased by +55.7% and −59.9%, respectively. The movement of this component shifted toward the positive sagittal axis direction. In addition, the relative displacement of sesamoid decreased by 87.4% (0.18 mm) in vertical axis direction and the stress was also redistributed on medial and lateral region. Moreover, the strain of the medial main ligament was more favorable to reconstruct function of the first ray.
Interpretation
The findings showed that the osteotomy method was helpful for stability of the first ray. This would provide the stability suggestions for postoperative hallux valgus fixation and guide further rehabilitation.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155948
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 1-8[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Contact force between the tibial spine and medial femoral condyle: A biomechanical study Type de document : Article Auteurs : Keith L. Markolf ; Peter Z. Du ; David R. McAllister ; [et al.] Article en page(s) : p. 9-12 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.09.025 Langues : Anglais (eng) Descripteurs : HE Vinci
Biomécanique ; OsteochondriteMots-clés : Cinématique du genou Force de contact Résumé : Background
Contact between the tibial spine and medial femoral condyle with internal tibial rotation (ITR) has been proposed as a factor for the development of osteochondritis dissecans lesions. We hypothesized that tibial spine contact force (CF) would increase significantly with applied internal tibial torque (IT).
Methods
A 20 mm diameter cylinder of bone encompassing the tibial spine was cored and attached to a load cell. The isolated bone cylinder included the tibial attachments of the anterior cruciate ligament (ACL) and anterior horn of the lateral meniscus (AHLM). Eleven human cadaveric knees were flexed from 0°–50° under 200 N of tibiofemoral compression (TFC), without and with 2 N-m IT. Tests were repeated with the AHLM cut, and again with both AHLM and ACL cut, where the load cell recorded CF alone without contributions from any ligamentous attachments.
Findings
There were no significant differences in CF, ITR, or valgus tibial rotation (VTR) after sectioning the AHLM, without or with applied IT. With no tibial torque, mean CFs were less than 20 N throughout the flexion range. Addition of IT significantly increased 1) mean CF by 44.4 N(SD 15.8 N) at 0°(+240%) and 27.2 N(SD 5.0 N) at 20°(+675%), 2), mean ITR by 10.2°(SD 0.8°) at 0° flexion and 18.6°(SD 2.0°) at 20° flexion, and 3) mean VTR by 1.3°(SD 0.4°) at 0° flexion and 4.4°(SD 0.8°) at 20° flexion.
Interpretation
Our hypothesis was confirmed only between 0° and 20° of knee flexion, where the intercondylar separation distance is relatively small and the possibility of tibial spine contact with ITR is greater.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155949
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 9-12[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Lesser lower extremity mechanical loading associates with a greater increase in serum cartilage oligomeric matrix protein following walking in individuals with anterior cruciate ligament reconstruction Type de document : Article Auteurs : Brittney Luc-Harkey ; Jason R. Franz ; Anthony C. Hackney ; [et al.] Article en page(s) : p. 13-19 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.09.024 Langues : Anglais (eng) Descripteurs : HE Vinci
Arthrose ; Cartilage ; Marche à pied ; Membre inférieur ; ProtéinesMots-clés : Charge mécanique Ligament croisé antérieur Résumé : Background
Aberrant mechanical loading during gait is hypothesized to contribute to the development of posttraumatic osteoarthritis following anterior cruciate ligament reconstruction. Our purpose was to determine if peak vertical ground reaction force and instantaneous vertical ground reaction force loading rate associate with the acute change in serum cartilage oligomeric matrix protein following a 20-minute bout of walking.
Methods
We enrolled thirty individuals with a unilateral anterior cruciate ligament reconstruction. Peak vertical ground reaction force and instantaneous vertical ground reaction force loading rate were extracted from the first 50% of the stance phase of gait during a 60-second trial. Blood samples were collected immediately before and after 20 min of treadmill walking at self-selected speed. The change in serum cartilage oligomeric matrix protein from pre- to post-walking was calculated. Stepwise linear regression models were used to determine the association between each outcome of loading and the change in serum cartilage oligomeric matrix protein after accounting for sex, gait speed, time since anterior cruciate ligament reconstruction, graft type, and history of concomitant meniscal procedure (ΔR2).
Findings
Lesser peak vertical ground reaction force (ΔR2 = 0.208; β = −0.561; P = 0.019) and instantaneous vertical ground reaction force loading rate (ΔR2 = 0.168; β = −0.519; P = 0.037) on the anterior cruciate ligament reconstructed limb associated with a greater increase in serum cartilage oligomeric matrix protein following 20 min of walking.
Interpretation
Mechanical loading may be a future therapeutic target for altering the acute biochemical response to walking in individuals with an anterior cruciate ligament reconstruction.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155950
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 13-19[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Modeling a rotator cuff tear: Individualized shoulder muscle forces influence glenohumeral joint contact force predictions Type de document : Article Auteurs : Meghan E. Vidt ; Anthony C. Santago ; A.P. Marsh ; [et al.] Article en page(s) : p. 20-29 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.004 Langues : Anglais (eng) Descripteurs : HE Vinci
Cinématique ; Epaule ; Force musculaire ; Sujet âgéMots-clés : Déchirure de la coiffe des rotateurs Articulation glénohumérale Résumé : Background
Rotator cuff tears in older individuals may result in decreased muscle forces and changes to force distribution across the glenohumeral joint. Reduced muscle forces may impact functional task performance, altering glenohumeral joint contact forces, potentially contributing to instability or joint damage risk. Our objective was to evaluate the influence of rotator cuff muscle force distribution on glenohumeral joint contact force during functional pull and axilla wash tasks using individualized computational models.
Methods
Fourteen older individuals (age 63.4 yrs. (SD 1.8)) were studied; 7 with rotator cuff tear, 7 matched controls. Muscle volume measurements were used to scale a nominal upper limb model's muscle forces to develop individualized models and perform dynamic simulations of movement tracking participant-derived kinematics. Peak resultant glenohumeral joint contact force, and direction and magnitude of force components were compared between groups using ANCOVA.
Findings
Results show individualized muscle force distributions for rotator cuff tear participants had reduced peak resultant joint contact force for pull and axilla wash (P ≤ 0.0456), with smaller compressive components of peak resultant force for pull (P = 0.0248). Peak forces for pull were within the glenoid. For axilla wash, peak joint contact was directed near/outside the glenoid rim for three participants; predictions required individualized muscle forces since nominal muscle forces did not affect joint force location.
Interpretation
Older adults with rotator cuff tear had smaller peak resultant and compressive forces, possibly indicating increased instability or secondary joint damage risk. Outcomes suggest predicted joint contact force following rotator cuff tear is sensitive to including individualized muscle forces.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155951
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 20-29[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Establishing the waist as the better location for attaching a single accelerometer to estimate center of pressure trajectories Type de document : Article Auteurs : Vincent C.F. Chen ; Shih-Wei Chen Article en page(s) : p. 30-38 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.003 Langues : Anglais (eng) Descripteurs : HE Vinci
Chutes accidentelles ; Personne âgée fragileMots-clés : Accéléromètre Centre de pression Centre de gravité Résumé : Background
In this study, we seek to replace conventional force platforms with a single accelerometer for measuring Center of Pressure trajectories, in order to achieve portability and convenience without sacrificing accuracy.
Methods
We measure the actual Anterior/Posterior and Medial/Lateral Center of Pressure trajectories of ten healthy young subjects using a force platform, and compare them with estimated measurements derived from accelerometer signals collected from three body locations (upper trunk, waist, and lower thigh) using three machine learning algorithms (Neural Network, Genetic Algorithm, and Adaptive Network-based Fuzzy Inference System). Error ratios and correlation coefficients corresponding to body locations were compared via one-way repeated-measures ANOVA. The ratios and coefficients corresponding to the three algorithms were also compared using the same approach.
Findings
Estimated Anterior/Posterior trajectories indicated that measurements collected from the waist provided the lowest margins of error (8.1–8.4% v. 12.1–13.4%, P ≤ .001) and the highest correlation (.95 v. .82–.86, P ≤ .032). Estimated Medial/Lateral trajectories indicated that measurements collected from both the waist and thigh, as compared to the upper trunk, provided lower margins of error (7.0–7.3% v. 8.5–10.8%). In general, the waist is the better accelerometer attachment location.
Interpretation
The results of our study corroborate our deduction that the high correlation between Center of Pressure and body's Center of Mass provides the rationale to place the single accelerometer close to the waist for Center of Pressure estimations. This study also supports the feasibility of using one single accelerometer programmed with algorithms forDisponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155952
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 30-38[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Prevalence of ankle equinus and correlation with foot plantar pressures in people with diabetes Type de document : Article Auteurs : A. Searle ; M.J. Spink ; V.H. Chuter Article en page(s) : p. 39-44 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.006 Langues : Anglais (eng) Descripteurs : HE Vinci
Cheville ; Diabète ; Pression ; PrévalenceMots-clés : Hallux limitus Résumé : Background
An association between equinus and plantar pressure may be important for people with diabetes, as elevated plantar pressure has been linked with foot ulcer development. To determine the prevalence of equinus in community dwelling people with diabetes and to examine any association between presence of equinus and forefoot plantar pressures.
Methods
Barefoot (Tekscan HR Mat™) and in-shoe (Novel Pedar-X®) plantar pressure variables, non-weight bearing ankle range of motion and neuropathy status were assessed in 136 adults with diabetes (52.2% male; 47.8% with neuropathy; mean (standard deviation) age and diabetes duration: 68.4 (11.5) and 14.6 (11.1) years respectively).
Findings
Equinus, when measured as ≤5° dorsiflexion, was present in 66.9% of the cohort. There was a significant correlation between an equinus and barefoot (r = 0.247, p = 0.004) and in-shoe forefoot pressure time integrals (r = 0.214, p = 0.012) and in-shoe forefoot alternate pressure time integrals (r = 0.246, p = 0.004). Significantly more males (p Interpretation
Community dwelling adults with diabetes have a high rate of ankle equinus which is associated with increased forefoot pressure time integrals and a two-fold increased risk of high in-shoe peak pressures. Clinical assessment of an ankle equinus may be a useful screening tool to identify adults at increased risk of diabetic foot complications.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155953
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 39-44[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Biomechanical effects of position and angle of insertion for all-suture anchors in arthroscopic Bankart repair Type de document : Article Auteurs : Jae-Hoo Lee ; Yasuo Itami ; Bobak Hedayati ; [et al.] Article en page(s) : p. 45-50 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.002 Langues : Anglais (eng) Descripteurs : HE Vinci
BiomécaniqueMots-clés : Lésions de Bankart Ancrage Angle d'insertion de la cheville Rigidité Résumé : Background
The biomechanical properties of all-suture anchor for labral repair depending on the insertion angle and location are lacking. The purpose of this study was to quantify the biomechanical fixation characteristics of the anchor position and insertion angle of all-suture anchors for arthroscopic Bankart repair.
Methods
Twenty-four fresh frozen cadaveric glenoid were used. All-suture anchors with 1.5-mm diameter were randomly inserted at 2:30, 4:00, and 5:30 o'clock positions on the glenoid edge, with either 30°, 45° or 60° insertion angles to the mediolateral axis of the glenoid. Anchors were preloaded to 5 N and cyclically loaded from 5 N to 20 N for 10 cycles, followed by a load to failure test at 60 mm/min. Permanent, non-recoverable displacement was quantified at the end of the cyclic loading test to yield load.
Findings
All-suture anchors implanted at the 2:30 o'clock position of the glenoid provided greater stiffness, yield load, and ultimate load than those inserted at the 4:00 and 5:30 o'clock positions, regardless of the insertion angle. Displacement at yield and ultimate load were similar among the positions and insertion angles (yield load, vs. 4:00, p = 0.01; vs. 5:30, p = 0.045; ultimate load, vs. 4:00, p Interpretation
The insertion angle of all-suture anchors does not significantly affect the stability at antero-inferior quadrant of the glenoid.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155954
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 45-50[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Instrumented finger-to-nose test classification in children with ataxia or developmental coordination disorder and controls Type de document : Article Auteurs : O. Martinez-Manzanera ; T.F. Lawerman ; H.J. Blok Article en page(s) : p. 51-59 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.007 Langues : Anglais (eng) Descripteurs : HE Vinci
Ataxie ; Enfant (6-12 ans)Mots-clés : Trouble développemental de la coordination Test doigt-nez Résumé : Background
During childhood, many conditions may impact coordination. Examples are physiological age-related development and pathological conditions, such as early onset ataxia and developmental coordination disorder. These conditions are generally diagnosed by clinical specialists. However, in absence of a gold phenotypic standard, objective reproducibility among specialists appears limited.
Methods
We investigated whether quantitative analysis of an upper limb coordination task (the finger-to-nose test) could discriminate between physiological and pathological conditions impacting coordination. We used inertial measurement units to estimate movement trajectories of the participants while they executed the finger-to-nose test. We employed random forests to classify each participant in one category.
Findings
On average, 87.4% of controls, 74.4% of early onset ataxia and 24.8% of developmental coordination disorder patients were correctly classified. The relatively good classification of early onset ataxia patients and controls contrasts with the poor classification of developmental coordination disorder patients.
Interpretation
In absence of a gold phenotypic standard for developmental coordination disorder recognition, it remains elusive whether the finger-to-nose test in these patients represents a sufficiently accurate entity to reflect symptoms distinctive of this disorder. Based on the relatively good results in early onset ataxia patients and controls, we conclude that quantitative analysis of the finger-to-nose test can provide a reliable support tool during the assessment of phenotypic early onset ataxia.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155955
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 51-59[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Adjustable-length loop cortical button versus interference screw fixation in quadriceps tendon anterior cruciate ligament reconstruction – A biomechanical in vitro study Type de document : Article Auteurs : Roman Frederik Karkosch ; Max Ettinger ; Samuel Bachmaier ; [et al.] Article en page(s) : p. 60-65 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.001 Langues : Anglais (eng) Descripteurs : HE Vinci
TendonsMots-clés : Étude biomécanique Quadriceps Fixation tibiale Dispositif à boucle ajustable Résumé : Background
This biomechanical cadaveric in vitro study aimed to evaluate and compare the dynamic elongation behavior and ultimate failure strength of tibial adjustable-length loop cortical button versus interference screw fixation in quadriceps tendon-based anterior cruciate ligament reconstruction.
Methods
Sixteen human quadriceps tendons were harvested and fixed into porcine tibiae using either biodegradable interference screw (n = 8) or adjustable loop device (n = 8) fixation. An acrylic block was utilized for femoral adjustable loop device fixation for both groups. All constructs were precycled for 10 times at 0.5 Hz and manually retensioned before tested in position and force control mode each for 1000 cycles at 0.75 Hz according to in vitro loading conditions replicating the in vivo ACL environment. Subsequently, an ultimate failure test at 50 mm/min was performed with mode of failure noted.
Findings
Tibial IS fixation showed no statistically significant differences in the initial (−0.46 vs. −0.47 mm; P = 0.9780), dynamic (2.18 mm vs. 2.89 mm; P = 0,0661), and total elongation (1.72 mm vs. 2.42 mm; P = 0,0997) compared to adjustable loop device fixation. The tibial button fixation revealed an increased ultimate failure load (743.3 N vs. 606.3 N; P = 0.0027), while stiffness was decreased in comparison to screw fixation (133.2 N/mm vs. 153.5 N/mm; P = 0,0045).
Interpretation
Anterior cruciate ligament reconstruction for quadriceps tendon graft using a tibial adjustable-length loop cortical button provides for comparable dynamic stabilization of the knee with increased ultimate failure load at decreased stiffness compared to screw fixation.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155956
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 60-65[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Variation in human vertebral body strength for vertebral body samples from different locations in segments L1–L5 Type de document : Article Auteurs : M.B. Ogurkowska ; A. Blaszczyk Article en page(s) : p. 66-75 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.008 Langues : Anglais (eng) Descripteurs : HE Vinci
StressMots-clés : Force mécanique Vertèbres lombaires Os spongieux Résumé : Background
The human spine, in particular the lumbar spine, is subject to significant compressive and bending stresses, which affect the structure of the bone tissue of the vertebrae. The more heterogeneous the structure of the spongy bone tissue, the less resistant the whole vertebral body. It is therefore necessary to establish variations in bone strength parameters within one particular vertebral body.
Methods
The research material comprised human L1–L5 lumbar vertebrae sampled from 15 donors aged 29–35. A total of 975 samples prepared from the collected material were subjected to compressive and bending strength tests. The samples for the tests were collected from carefully selected locations in order to discover the strength properties of various parts of the vertebral body.
Findings
In the case of sample 2 (located in the posterior part of the vertebra, at mid-height) the stress values were the lowest and there were statistically significant differences compared to other samples. Moreover the value of compressive force in this case was lower for vertebrae with higher numbers. Top and bottom samples demonstrated statistically significant higher mean values of destructive stress. In terms of the bending strength test, the mean value of destructive stress in all lumbar vertebrae for all samples increased for vertebrae with higher numbers.
Interpretation
The spongy tissue in healthy vertebral bodies has a very heterogeneous structure. This may be due to the presence of the nutrient canal and the arc structure allowing more springy movement and improved transfer of loads by the vertebral body.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155957
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 66-75[article]Exemplaires (1)
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Titre : Biomechanical analysis on of anterior transpedicular screw-fixation after two-level cervical corpectomy using finite element method Type de document : Article Auteurs : Liujun Zhao ; Jianqing Chen ; Jiayong Liu ; [et al.] Article en page(s) : p. 76-82 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.09.008 Langues : Anglais (eng) Descripteurs : HE Vinci
Analyse ; Biomécanique ; Microcéphalie fusions des vertèbres cervicalesMots-clés : Fixation interne Résumé : Background
Anterior cervical trans-pedicle screw fixation was introduced to overcome some of the disadvantages associated with anterior cervical corpectomy and fusion. In vitro biomechanical studies on the trans-pedicle screw fixation have shown excellent pull-out strength and favorable stability. Comprehensive biomechanical performance studies on the trans-pedicle screw fixation, however, are lacking.
Methods
The control computed tomography images (C2-T2) were obtained from a 22-year-old male volunteer. A three dimensional computational model of lower cervical spine (C3-T1) was developed using computed tomography scans from a 22 year old human subject. The models of intact C3-T1 (intact group), anterior cervical trans-pedicle screw fixation (trans-pedicle group), and anterior cervical corpectomy and fusion (traditional group) were analyzed with using a finite element software. A moment of 1 N·m and a compressive load of 73.6 N were loaded on the upper surface and upper facet joint surfaces of C3. Under six conditions, four parameters such as the range of motion, titanium mesh plant stress, end-plate stress, and bone-screw stress were measured and compared on two treatment groups.
Findings
Compared with the intact model, the range of motions for treatment groups were decreased. Compared with cervical corpectomy and fusion, the titanium plant, C4 upper end-plate and C7 lower end-plate stresses in trans-pedicle group were reduced. No significant difference was discovered on bone-screw stress between the two groups for lateral flexion and rotation, but bone-screw stress is smaller in trans-pedicle group when compared with traditional group. With exception of individual difference, trans-pedicle group had better biomechanical results than traditional group in range of motions, titanium mesh plant stress, end-plate stress and bone-screw stress.
Interpretation
The trans-pedicle method has better biomechanical properties than the anterior cervical corpectomy and fusion making it a viable alternative for cervical fixations.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155958
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 76-82[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité Clinical Biomechanics. Vol. 60 (December 2018) Périodique papier Woluwe Revues-W Consultation sur place uniquement
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Titre : Enhancement in median nerve mobility during radioulnar wrist compression in carpal tunnel syndrome patients Type de document : Article Auteurs : Yifei Yao ; Emily Grandy ; Peter J. Evans ; [et al.] Article en page(s) : p. 83-88 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.017 Langues : Anglais (eng) Descripteurs : HE Vinci
Syndrome du canal carpienMots-clés : Compression du poignet Échographie dynamique Mobilité nerveuse médiane Résumé : Background
Carpal tunnel syndrome is a compression neuropathy at the wrist associated with compromised median nerve mobility. The purpose of this study was to investigate the effects of radioulnar wrist compression on median nerve longitudinal mobility within the carpal tunnel in carpal tunnel syndrome patients as well as healthy subjects.
Methods
Dynamic ultrasound images captured longitudinal median nerve motion in the carpal tunnel during radioulnar wrist compression force application in 11 healthy subjects and 11 carpal tunnel syndrome patients.
Findings
We found that median nerve mobility was not significantly affected by radioulnar wrist compression in healthy subjects (P = 0.34), but improved by 10 N radioulnar wrist compression in carpal tunnel syndrome patients (P Interpretation
Moderate radioulnar wrist compression force application helps restore impaired median nerve mobility and may be effective in improve nerve function and symptoms associated with carpal tunnel syndrome.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155959
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 83-88[article]Exemplaires (1)
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Titre : The effect of radial head prosthesis diameter on posterolateral rotatory instability of the elbow Type de document : Article Auteurs : Chad E. Songy ; Cory G. Couch ; Eric R. Siegel ; [et al.] Article en page(s) : p. 89-94 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.005 Langues : Anglais (eng) Descripteurs : HE Vinci
Coude ; Prothèses et implantsMots-clés : Ligament collatéral Instabilité rotatoire Résumé : Background
The purpose of this study is to investigate how different diameters of radial head replacement affect posterolateral translation with a valgus and supination force. We hypothesized that there would be less posterolateral rotatory translation with larger implant diameter.
Methods
Eleven cadaveric arms were stressed at 30 and 60° of flexion with a consistent supination and valgus stress force under five conditions: native radial head, radial head excision, and with 3 sizes of radial head prosthesis. Displacement of the radial head posteriorly in relation to the capitellum on radiographs was measured. Displacement was expressed as a percentage relative to the average of the maximum and minimum native radial head diameters.
Findings
The native radial heads had average minimum and maximum diameters of 23.3 mm and 25.2 mm, respectively. The angle of testing did not significantly change translation of the radial head. There was increased posterior translation relative to native head as the radial head sizes decreased from 24 mm to 20 mm and with excision of the radial head. Compared to the native head, the differences in displacement were statistically significant for the 20 mm radial head, but not for the 22 mm or 24 mm replacements. Radial head translation significantly increased after radial head excision.
Interpretations
This cadaveric study illustrates that patients treated with radial head excision and radial head prosthesis with undersized diameters have increased posterior translation with a valgus and supination stress. The larger the radial head prosthesis (closer to native radial head), the more closely it approximated the amount of translation of the native radial head.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155960
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 89-94[article]Exemplaires (1)
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Titre : In vivo dynamic acromiohumeral distance in shoulders with rotator cuff tears Type de document : Article Auteurs : Naoya Kozono ; Takamitsu Okada ; N. Takeuchi ; [et al.] Article en page(s) : p. 95-99 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.07.017 Langues : Anglais (eng) Descripteurs : HE Vinci
EpauleMots-clés : Distance acromiohumérale dynamique Déchirure de la coiffe des rotateurs Technique 2D-3D Résumé : Background
There are no previous studies on the acromiohumeral distance in shoulders with large-to-massive full-thickness rotator cuff tears. In this study, the acromiohumeral distance in rotator cuff tear and healthy shoulders was measured using 3D-to-2D model-to-image registration techniques.
Methods
The dynamic glenohumeral kinematics during scapular plane abduction and axial rotation were analyzed in 11 rotator cuff tear patients and 10 healthy control subjects. Periodic radiographic images of scapular plane abduction and axial rotation were taken using a flat-panel radiograph image detector. Movements of the shoulder joint were assessed using radiographic images and computed tomography-derived digitally reconstructed radiographs. The acromiohumeral distance was defined as the shortest 3D distance between the acromion and the proximal humerus.
Findings
For scapular plane abduction, the rotator cuff tear group had significantly smaller acromiohumeral distance than the control group at 15°, 30°, 45°, 60°, 75°, 135°, and 150° of humeral abduction (P Interpretation
The minimum measured acromiohumeral distance was 0.9 mm in the rotator cuff tear shoulders and 2.1 mm in the healthy shoulders at 90° of scapular plane abduction. The findings are of clinical relevance because quantitative evaluation of the dynamic acromiohumeral distances in rotator cuff tear and healthy shoulders might provide important insight into subacromial impingement.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155961
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 95-99[article]Exemplaires (1)
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Titre : Biomechanical properties following open wedge high tibial osteotomy: Plate fixator combined with dynamic locking screws versus standard locking screws Type de document : Article Auteurs : Steffen Schröter ; Tobias Hoffmann ; Stefan Döbele ; [et al.] Article en page(s) : p. 108-114 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.010 Langues : Anglais (eng) Mots-clés : Ostéotomie tibiale Vis de verrouillage dynamique Fracture de la charnière Cicatrisation osseuse Fixateur de plaque Résumé : Background
Open wedge high tibial osteotomy is widespread in treating osteoarthritis of the knee. Bone healing of the gap and the necessity of bone substitutes are under discussion. Increasing movement of the osteotomy gap can improve bone healing, while excessive movement should be avoided. It was hypothesised that the use of dynamic locking screws, compared to standard locking screws, will increase interfragmental motion while construct stability persists.
Methods
In 20 tibia sawbones open wedge high tibial osteotomy was performed using standard locking screws or dynamic locking screws. An incremental cyclic (2 Hz) compression to termination protocol was applied using a material testing machine (MTS MiniBionix 858). Relative motion of the osteotomy and construct stability were measured using an optical tracking system (PONTOS 5M system). Levels of significance were set to 0.05.
Findings
19 Sawbones were statistically evaluated. Interfragmental motion increased significantly with dynamic locking screws compared to standard locking screws (P Interpretation
Using dynamic locking screws in open wedge high tibial osteotomy increases interfragmental motion within the range of optimal bone healing. A decrease in construct stability has to be considered compared to standard locking screws.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155962
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 108-114[article]Exemplaires (1)
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Titre : Effects of static stretching on mechanical properties and collagen fiber orientation of the Achilles tendon in vivo Type de document : Article Auteurs : Keitaro Kubo Article en page(s) : p. 115-120 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.013 Langues : Anglais (eng) Descripteurs : HE Vinci
Échographie ; Tendon d'AchilleMots-clés : Syndrome du canal tarsien Fléchisseur plantaire Raideur Résumé : Background
The study was designed to examine changes in tendon properties measured during ramp and ballistic contractions after static stretching and to elucidate the relationship between stretching-induced changes in tendon properties (particularly hysteresis) and collagen fiber orientation.
Methods
Thirteen males performed static stretching, in which the ankle was passively flexed to 36° dorsiflexion and remained stationary for 10 min. Before and after stretching, the stiffness and hysteresis of tendon structures in the medial gastrocnemius muscle were measured using ultrasonography during ramp and ballistic contractions. Tendon collagen fiber orientation was also estimated from the coefficient of variation (CV) of echogenicity on transverse ultrasonic images of the Achilles tendon.
Findings.
The hysteresis of tendon structures significantly decreased by 15.5% (p = 0.005) during ramp contractions and by 15.3% (p = 0.003) during ballistic contractions after stretching, whereas stiffness did not. The mean echogenicity of the Achilles tendon significantly increased by 6.0% (p = 0.002) after stretching, whereas the CV of echogenicity did not (p = 0.148). Furthermore, the relative change in mean echogenicity, which reflected interstitial fluid movement within tendons, tended to be correlated to that in hysteresis measured during ballistic contractions (r = 0.439, p = 0.133).
Interpretation
These results suggest that the hysteresis, but not stiffness, of tendon structures measured during ramp and ballistic contractions significantly decreased after stretching. Furthermore, a decline in the hysteresis of tendon structures after static stretching was associated with interstitial fluid movement within tendons, but not to changes in collagen fiber orientation.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155963
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 115-120[article]Exemplaires (1)
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Titre : Suture-button fixation and anterior inferior tibiofibular ligament augmentation with suture-tape for syndesmosis injury: A biomechanical cadaveric study Type de document : Article Auteurs : Hiroaki Shoji ; Atsushi Teramoto ; Daisuke Suzuki ; [et al.] Article en page(s) : p. 121-126 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.014 Langues : Anglais (eng) Descripteurs : HE Vinci
BiomécaniqueMots-clés : Articulation talocrurale Ligament tibio-fibulaire antérieur-inférieur Bouton de suture Bande de suture Résumé : Background
Suture-button (SB) fixation has been widely performed for syndesmosis injuries, but it has been reported unstable in some biomechanical studies. The purpose of this study was to evaluate the stability of the syndesmosis using SB fixation with anterior inferior tibiofibular ligament augmentation using suture-tape (ST).
Methods
Eight normal fresh-frozen cadaveric legs were used. After initial tests of intact and injured models, SB fixation, SB fixation with ST augmentation, ST augmentation alone, and screw fixation were performed sequentially for each specimen. Loading tests stimulating dorsiflexion, inversion, and external rotation of the ankle joint were performed for each model. The tibiofibular diastasis (TFD) and the fibular rotational angle related to the tibia (FRA) were measured using a magnetic tracking system.
Findings
In the injured model, both TFD and FRA increased significantly compared with the intact model in all directions (P .05). In the screw fixation model, FRA with inversion force at the ankle was significantly decreased compared with the intact model (P = .027).
Interpretation
SB fixation alone did not provide stability of the syndesmosis, and screw fixation became too rigid compared with the intact model. Using ST augmentation achieved dynamic stability similar to the intact model for syndesmotic injuries.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155964
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 121-126[article]Exemplaires (1)
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Titre : Low-dose hip abductor-adductor power training improves neuromechanical weight-transfer control during lateral balance recovery in older adults Type de document : Article Auteurs : Mario Inacio ; Rob Creath ; Mark W. Rogers Article en page(s) : p. 127-133 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.018 Langues : Anglais (eng) Mots-clés : Entraînement musculaire Abducteurs de la hanche Performances neuromusculaires Résumé : Background
Age-related neuromuscular changes in the hip abductor-adductor muscles lead to reduced performance, especially in the rate of force development and power production. These alterations may impair weight transfer control and lateral balance recovery through protective stepping. This study compared the effects of eight weeks of low-dose hip abductor-adductor power and strength training on the performance of isometric maximal voluntary contractions, and lateral balance recovery at different initial weight-bearing conditions in older individuals.
Methods
Eighteen healthy older adults (71.3 (0.9) years) underwent eight weeks of low-dose hip abductor-adductor exercise training involving either power training (n = 10) or lower velocity strength training (n = 8). Outcomes were assessed for hip abductor-adductor isometric maximal voluntary contractions and lateral waist-pull balance perturbations with three initial stepping limb-load conditions (50%, 65%, or 80% body mass).
Findings
Power training increased isometric maximal voluntary contractions abductor-adductor peak torque (14%–18%, p Interpretation
Low-dose hip abductor-adductor power training was more effective than strength training at eliciting improvements in maximal neuromuscular performance and enhanced medio-lateral balance recovery.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155965
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 127-133[article]Exemplaires (1)
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Titre : Passive elastic contribution of hip extensors to joint moments during walking in people with low back pain Type de document : Article Auteurs : Mark G. Hines ; Neale Tillin ; Jin Luo ; [et al.] Article en page(s) : p. 134-140 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.012 Langues : Anglais (eng) Descripteurs : HE Vinci
Marche à pied ; PuissanceMots-clés : Extenseur de la hanche Douleurs lombaires Résumé : Background
It has been found that alterations in passive muscle properties may be associated with low back pain, and these may be responsible for the altered gait parameters often observed in subjects with back pain. The purpose of the present study was to assess total hip and passive hip extensor moments in people with or without low back pain during the hip flexion component of walking.
Methods
52 subjects volunteered for this study (low back pain group, n = 25 (male n = 13, female n = 12), control group, n = 27 (male n = 15, female n = 12)). Passive hip moments were calculated using an adapted force transducer during supine testing. A biomechanical model and predictive equation were used to calculate passive hip moments during walking. Total hip moments were calculated with the use of a 9 camera, 3-D motion-capture system.
Findings
Independent samples t-tests demonstrated no significant differences between groups for gait parameters or hip or knee angles. Results of the ANOVAs demonstrated significant differences in passive hip flexor moments during the second half of hip flexion (P Interpretation
The present data demonstrates that subjects with low back pain have altered passive hip extensor and total power and work done during walking compared with healthy controls. Biomechanical models should include individual measurements of passive joint moments.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155966
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 134-140[article]Exemplaires (1)
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Titre : Integrative modeling of drug therapy and the bone turnover Type de document : Article Auteurs : Sana Javed ; Ayesha Sohail ; Alessandro Nutini Article en page(s) : p. 141-148 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.019 Langues : Anglais (eng) Descripteurs : HE Vinci
Remodelage osseux ; Traitement médicamenteuxMots-clés : Pharmacothérapie Résumé : Background
Denosumab has been successfully used for the postmenopausal osteoporosis treatment. This research is focused on the computational analysis of the effect of denosumab on bone remodeling.
Methods
Inspired by the advancement in the field of multiscale modeling , this research encompasses on the cellular and molecular bone remodeling key players. The model is designed to cover all the dominant interacting factors and their respective gradients. During this research, we have performed numerical experiments to validate our mathematical model, by interfacing it with the parametric values available in the literature.
Findings
The novelty of our work relies in the fact that we have considered the effect of estrogen, sclerostin and NFATc1 during osteoporosis and their combined effect with the variable effect of denosumab during therapy.
Interpretations
From our analysis, we have concluded that denosumab suppresses osteoclast differentiation, that results in reduced bone resorption. These results are in agreement with the experimental findings.
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in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 141-148[article]Exemplaires (1)
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Titre : Subjects with medial and lateral tibiofemoral articular cartilage defects do not alter compartmental loading during walking Type de document : Article Auteurs : Sam Van Rossom ; Nidal Khatib ; Cathy Holt ; [et al.] Article en page(s) : p. 149-156 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.015 Langues : Anglais (eng) Descripteurs : HE Vinci
ArthroseMots-clés : Force de contact Démarche Défaut du cartilage Pression de contact Résumé : Background
Healthy cartilage is essential for optimal joint function. Although, articular cartilage defects are highly prevalent in the active population and hamper joint function, the effect of articular cartilage defects on knee loading is not yet documented. Therefore, the present study compared knee contact forces and pressures between patients with tibiofemoral cartilage defects and healthy controls. Potentially this provides additional insights in movement adaptations and the role of altered loading in the progression from defect towards OA.
Methods
Experimental gait data collected in 15 patients with isolated cartilage defects (8 medial involvement, 7 lateral-involvement) and 19 healthy asymptomatic controls was processed using a musculoskeletal model to calculate contact forces and pressures. Differences between two patient groups and controls were evaluated using Kruskal-Wallis tests and individually compared using Mann-Whitney-U tests (alpha Findings
The patients with lateral involvement walked significantly slower compared to the healthy controls. No movement adaptations to decrease the loading on the injured condyle were observed. Additionally, the location of loading was not significantly affected.
Interpretation
The current results suggest that isolated cartilage defects do not induce significant changes in the knee joint loading distribution. Consequently, the involved condyle will capture a physiological loading magnitude that should however be distributed over the cartilage surrounding the defect. This may cause local degenerative changes in the cartilage and in combination with inflammatory responses, might play a key role in the progression from articular cartilage defect to a more severe OA phenotype.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155968
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 149-156[article]Exemplaires (1)
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Titre : The influence of balance, physical disability, strength, mechanosensitivity and spinal mobility on physical activity at home, work and leisure time in women with fibromyalgia Type de document : Article Auteurs : Laura Ceron-Lorente ; M.C. Valenza ; José Manuel Pérez-Marmol ; [et al.] Article en page(s) : p. 157-163 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.009 Langues : Anglais (eng) Descripteurs : HE Vinci
Femmes ; FibromyalgieMots-clés : Fonction physique Évaluation de l'activité physique Comportement moteur Santé fonctionnelle Performance fonctionnelle Résumé : Background
Fibromyalgia syndrome is a chronic disease consisting of widespread pain, fatigue, sleep disturbances, and cognitive impairments, among other symptoms, which affect daily physical activity. However, the influence of functional status on physical activity involved in leisure, household and work activities has not been researched previously. The main objective was to evaluate balance, strength, spinal mobility, mechanosensitivity and function levels as related factors of physical activity in female with fibromyalgia.
Methods
Thirty-four patients with Fibromyalgia and 22 matched controls were included in a cross-sectional study. Dynamic and static balance, general and daily activities disability, lumbosacral mechanosensitivity, spinal range of motion, lower limb strength, physical activity in leisure, household and work activities were registered. We tested for differences between groups by using independent sample t-tests. The influence of demographics, symptoms and physical outcomes on physical activity was statistically analyzed using bivariate and multivariate regression analyses.
Findings
There was a significant association between leisure-time physical activity scores and age (r = 0.564), spinal flexion (r = 0.512), spinal extension (r = 0.421) and the total range of spinal inclination (r = 0.533). Fifty-eight percent of the variance of leisure-time physical activity was explained by age and range of spinal flexion-extension. Similarly, functional mobility was associated with physical activity at home and work scores (r = 0.459), explaining 21% of its variance.
Interpretation
A higher time spent in leisure, household and work activities was related to higher age, spinal range of motion and lower functional mobility in women with Fibromyalgia. Rehabilitation intervention programs should promote physical activity at home, work and leisure time.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155969
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 157-163[article]Exemplaires (1)
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Titre : Muscular co-contraction is related to varus thrust in patients with knee osteoarthritis Type de document : Article Auteurs : Philippe C. Dixon ; Sharleen Gomes ; Richard Preuss ; [et al.] Article en page(s) : p. 164-169 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.021 Langues : Anglais (eng) Descripteurs : HE Vinci
ElectromyographieMots-clés : Arthrose du genou Démarche en varus Résumé : Background
Patients with knee osteoarthritis often present with varus thrust and muscular co-contraction during gait. It is unclear if these adaptations are related. The objective was to examine the relationship between muscle co-contraction and varus thrust during gait in patients with knee osteoarthritis and to determine if these relationships are modulated by disease severity or history of knee ligament rupture.
Methods
Participants (n = 42, 23 women, mean age 58 years) with knee osteoarthritis completed gait trials at self-selected speeds. Varus thrust was measured with an eight camera motion capture system sampled at 100 Hz. Co-contraction ratios were measured with surface electromyography sampled at 2000 Hz over the quadriceps, hamstrings, and gastrocnemius. Disease severity was measured on radiographs and history of anterior cruciate ligament rupture was confirmed on magnetic resonance imaging. Linear regression analyses examined the relationship between varus thrust and co-contraction ratios after controlling for radiographic disease severity and history of anterior cruciate ligament rupture.
Findings
Higher vastus lateralis–lateral hamstring (b = 0.081, P 0.05). Radiographic disease severity or history of anterior cruciate ligament injury did not significantly contribute to regression models.
Interpretation
Greater quadriceps-hamstring co-contraction is associated with greater varus thrust in patients with knee osteoarthritis. Potential explanations include increased co-contraction may provide stability or there is a proprioceptive reflex that is independent of any stabilizing role. Research is needed to test these hypotheses.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155970
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 164-169[article]Exemplaires (1)
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Titre : Central adiposity and mechanical, perceptual and physiological loading during long duration, repetitive lifting Type de document : Article Auteurs : Robert Pryce ; Dean Kriellaars Article en page(s) : p. 170-176 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.011 Langues : Anglais (eng) Descripteurs : HE Vinci
ObésitéMots-clés : Fréquence cardiaque Manipulation de matériel Résumé : Background
There is an absence of information regarding the impact of central adiposity on loading during long duration, repetitive lifting, and very limited information of the impact of elevated body mass on mechanical loading of the lumbar spine. This information is important in evaluation of the validity of injury prevention standards and interventional approaches in this segment of the population.
Methods
This study evaluated the mechanical, physiological, and perceptual loading during repetitive lifting in participants with central adiposity compared to participants with normal body mass index. Videography, accelerometry, heart rate and perceived exertion measures were used to examine alternations in kinematic, kinetic, and exertional parameters during a 1-hour lifting task (3 * 20-min sets; 4 lifts/min; self-selected mass).
Findings
Low back torque [+69.1 (11.5) Nm], compressive force [+1036.6 (153.6) N] and heart rate [+7.0 (3.5)%] were substantially elevated in participants with central adiposity, however perceived exertion and self-selected mass did not differ between groups. With central adiposity a compensatory mechanism was observed, involving a reduction in trunk vertical displacement [−5.8 (1.9) cm], hip flexion [−6.4 (3.1) deg] and lower-trunk flexion [−10.0 (2.7) deg], which attenuated expected increases to work [9.8 (2.3)%], power [9.5 (4.0)%] and physiological effort.
Interpretation
While mechanical loading increases secondary to elevated body mass are expected, these results provide new insight into origins of such increases for individuals with a central adiposity somatotype. The differences in mechanical, physiological and perceived loading support provision of individual-specific injury prevention strategies, as well as revision of existing mechanical- and physiological-based ergonomic standards.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155971
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 170-176[article]Exemplaires (1)
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Titre : The relationship between coronary lesion characteristics and pathologic shear in human coronary arteries Type de document : Article Auteurs : Ashkan Javadzadegan ; Abouzar Moshfegh ; Yi Qian ; [et al.] Article en page(s) : p. 177-184 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.023 Langues : Anglais (eng) Mots-clés : Artères coronaires Morphologie de la lésion Dynamique numérique des fluides Résumé : Background
Pathological shear stress is associated with distinct pathogenic biological pathways relevant to coronary thrombosis and atherogenesis. Although the individual effects of lesion characteristics including stenosis severity, eccentricity and lesion length on coronary haemodynamics is known, their relative importance remains poorly understood.
Methods
Computational fluid dynamics (CFD) was implemented for haemodynamic analysis of 104 coronary arteries. For each coronary artery, maximum shear stress at the site of maximal stenosis, average shear stress over the sites of maximal stenosis segment, average shear stress in the proximal segments and average shear stress in the distal segments were determined. In addition, the area of low wall shear stress (ALWSS) sites in post-stenotic regions were quantified as a proportion of the vessel segment.
Results
With increasing stenosis severity, eccentricity and lesion length, maximal and average shear stress over the sites of maximal stenosis and ALWSS increased whereas average shear stress in the proximal segments decreased. Two-way ANCOVA analysis revealed that stenosis severity and lesion length were both independent predictors of maximum shear at the site of maximal stenosis [F (1, 104) = 10.94, P = 0.001 for diameter stenosis and F (1, 104) = 6.21, P = 0.014 for lesion length] and ALWSS [F (1, 104) = 66.10, P = 0.001 for diameter stenosis and F (1, 104) = 4.23, P = 0.047 for lesion length].
Conclusion
Our findings demonstrate that although all lesion characteristics correlate with abnormal shear stress, only stenosis severity and lesion length are independent predictors of pathogenic physiological processes.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155972
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 177-184[article]Exemplaires (1)
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Titre : Quantifying joint stiffness in clubfoot patients Type de document : Article Auteurs : M.C. van der Steen ; P.A. Andrei ; B. van Rietbergen ; [et al.] Article en page(s) : p. 185-190 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.022 Langues : Anglais (eng) Descripteurs : HE Vinci
Pied bot ; RécidiveMots-clés : Douleur articulaire Articulation de la cheville Résumé : Background
In clinical practice, clubfeet feel stiffer compared to healthy feet. Furthermore, the clinical impression is that stiffer clubfeet have a higher tendency to relapse. Until now, no objective measure has been available to determine the stiffness of clubfeet. The goal of the current project was to objectively quantify ankle and subtalar joint stiffness in clubfeet patients and to compare this stiffness between clubfeet patients and healthy controls using a newly developed measurement device.
Methods
The newly developed Torque-Displacement-Handpiece in combination with an adjusted Abduction Dorsiflexion Mechanism clubfoot-brace, made it possible to move a foot over two rotational axis, while continuously capturing the applied torque and the achieved angulation. Based on this information, stiffness of the ankle and subtalar joint were assessed for 11 clubfoot patients with 17 clubfeet and 11 healthy subjects with 22 healthy feet.
Findings
With the Torque-Displacement-Handpiece measuring device it was possible to measure torque, angulation and stiffness in a reliable and precise manner. Clubfoot patients showed less angulation and a higher stiffness for measurements over the ADM subtalar axis compared to controls. After adjusting for shoe size, the stiffness for measurements over the ADM tibiotalar axis was also significantly higher in clubfeet than controls.
Interpretation
Overall, these results indicate that clubfoot patients have a higher ankle and subtalar joint stiffness in the affected joint compared to healthy controls. In the future, the Torque-Displacement-Handpiece could be used to monitor stiffness of clubfeet during treatment, and as such, play a potential role in the early detection of relapsing clubfeet.
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in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 185-190[article]Exemplaires (1)
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Titre : A biomechanical breast model evaluated with respect to MRI data collected in three different positions Type de document : Article Auteurs : Anna Mira ; Ann-Katherine Carton ; Serge Muller ; [et al.] Article en page(s) : p. 191-199 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.10.020 Langues : Anglais (eng) Mots-clés : Poitrine Matrice de soutien du sein Hyper-élasticité Optimisation Résumé : Background
Mammography is a specific type of breast imaging that uses low-dose X-rays to detect cancer in early stage. During the exam, the women breast is compressed between two plates in order to even out the breast thickness and to spread out the soft tissues. This technique improves exam quality but can be uncomfortable for the patient. The perceived discomfort can be assessed by the means of a breast biomechanical model. Alternative breast compression techniques may be computationally investigated trough finite elements simulations.
Methods
The aim of this work is to develop and evaluate a new biomechanical Finite Element (FE) breast model. The complex breast anatomy is considered including adipose and glandular tissues, muscle, skin, suspensory ligaments and pectoral fascias. Material hyper-elasticity is modeled using the Neo-Hookean material models. The stress-free breast geometry and subject-specific constitutive models are derived using tissues deformations measurements from MR images.
Findings
The breast geometry in three breast configurations were computed using the breast stress-free geometry together with the estimated set of equivalent Young's modulus (Ebreastr = 0.3 kPa, Ebreastl = 0.2 kPa, Eskin = 4 kPa, Efascia = 120 kPa). The Hausdorff distance between estimated and measured breast geometries for prone, supine and supine tilted configurations is equal to 2.17 mm, 1.72 mm and 5.90 mm respectively.
Interpretation
A subject-specific breast model allows a better characterization of breast mechanics. However, the model presents some limitations when estimating the supine tilted breast configuration. The results show clearly the difficulties to characterize soft tissues mechanics at large strain ranges with Neo-Hookean material models.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155974
in Clinical Biomechanics > Vol. 60 (December 2018) . - p. 191-199[article]Exemplaires (1)
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| Cote | Support | Localisation | Section | Disponibilité |
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| Clinical Biomechanics. Vol. 60 (December 2018) | Périodique papier | Woluwe | Revues-W | Consultation sur place uniquement Exclu du prêt |
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Titre : Knee motion and muscle activation patterns are altered in hip osteoarthritis: The effect of severity on walking mechanics Type de document : Article Auteurs : Derek Rutherford ; Lindsey Buckingham ; Janice Moreside Article en page(s) : p. 1-7 Langues : Anglais (eng) Descripteurs : HE Vinci
Coxarthrose ; Electromyographie ; GenouMots-clés : Osteoarthritis Hip Biomechanical Phenomena Phénomènes biomécaniques Knee Gait Démarche Electromyography Résumé : Background
Knee function is impaired in individuals with moderate hip osteoarthritis. How this extends to those undergoing total hip arthroplasty is unknown despite the common requirement for knee arthroplasty in this population. The study purpose was to determine whether sagittal plane knee joint movements and quadriceps and hamstring activation patterns differ between individuals with either moderate or severe unilateral hip osteoarthritis, and between ipsilateral and contralateral knees.
Methods
20 individuals with moderate osteoarthritis and 20 with severe osteoarthritis were recruited. Sagittal knee motion and surface electromyograms from the hamstrings and quadriceps were collected during treadmill walking at a self-selected speed. Principal component analysis captured amplitude and temporal sagittal plane motion and EMG waveform features. Student's t-tests and Analysis of Variance determined between group differences and within/between group leg differences.
Findings
The severe groups' contralateral knee was in greater flexion at initial contact and demonstrated a movement profile of a longer stance phase (p Interpretation
Altered kinematics and muscle activity could contribute to a greater mechanical demand on the contralateral knee in those with more severe hip osteoarthritis.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155922
in Clinical Biomechanics > Vol. 59 (2018) . - p. 1-7[article]Exemplaires (1)
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Titre : Impact of multilevel joint contractures of the hips, knees and ankles on the Gait Profile score in children with cerebral palsy Type de document : Article Auteurs : Sarah J. Holmes ; Anita J. Mudge ; Elizabeth A. Wojciechowski Article en page(s) : p. 8-14 Langues : Anglais (eng) Descripteurs : HE Vinci
Paralysie cérébraleMots-clés : Cerebral Palsy Gait Démarche Walking Marche à pied Contracture Range of Motion Articular Amplitude articulaire Résumé : Background
Children with cerebral palsy are at risk of developing muscle contractures, often contributing to pain, structural deformities and mobility limitations. With the increasing use of gait indices to summarise the findings of three dimensional gait analysis (3DGA), the purpose of this study is to determine whether there is a relationship between multilevel joint contractures and the Gait Profile Score in children with cerebral palsy.
Methods
The Gait Profile Score, calculated from 3D gait analysis, and passive range of motion, strength and spasticity of the hips, knees and ankles in the sagittal plane were measured in 145 children with cerebral palsy (mean age:11 years,4 months; SD:2 years,10 months) (83 males) enrolled in the NSW Paediatric Gait Analysis Service Research Registry from 2011 to 2016. The relationships between these physical measures and the Gait Profile Score were explored using bivariate and multivariate correlations.
Findings
Reduced hip extension, knee extension and ankle dorsiflexion (knee extended) range of motion were correlated with a higher (worse) Gait Profile Score (r = −0.348 to −0.466, p Interpretation
The Gait Profile Score is a sensitive measure for demonstrating the relationship between multilevel sagittal plane joint contractures and kinematic gait. Clinically, this supports the use of the Gait Profile Score as a simplified measure to understand the contribution of contractures to functional gait limitations. Monitoring knee flexion strength, and hip extension and ankle dorsiflexion (knee extended) range of motion may assist clinicians in prioritising interventions to improve gait in this population.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155923
in Clinical Biomechanics > Vol. 59 (2018) . - p. 8-14[article]Exemplaires (1)
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Titre : Is it possible to predict falls in older adults using gait kinematics? Type de document : Article Auteurs : Nise Ribeiro Marques ; Deborah Hebling Spinoso ; Bruna Carvalho Cardoso Article en page(s) : p. 15-18 Langues : Anglais (eng) Descripteurs : HE Vinci
Kinésithérapie (spécialité) ; Mobilité réduite ; VieillissementMots-clés : Biomechanical Phenomena Phénomènes biomécaniques Aging Physical Therapy Specialty Mobility Limitation Résumé : Background
Gait kinematic parameters have been reported as an important clinical tool to assess the risk of falls in older adults. However, the ability of these parameters to predict falls in the older population is still unclear.
Objective
To identify the ability that gait kinematic parameters present to predict fall in older adults.
Methods
Data from 102 older adults, who live in a community setting, were considered for this study. For data collection, older subjects had to walk on a 14 meter-walkway in their preferred gait speed. The incidence of falls was recorded at baseline together with gait kinematics and then every three months during the period of the study. The ability of gait kinematic parameters to predict falls was tested using the ROC curve.
Results
Stance time variability, swing time, and stride length presented a sensitivity to predict falls in older adults higher than 70%.
Conclusion
Gait kinematic parameters, such as stance variability, swing time, and stride length may predict future falls in older adults.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155924
in Clinical Biomechanics > Vol. 59 (2018) . - p. 15-18[article]Exemplaires (1)
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Titre : Strain behavior of malaligned cervical spine implanted with metal-on-polyethylene, metal-on-metal, and elastomeric artificial disc prostheses – A finite element analysis Type de document : Article Auteurs : Wen-Ming Chen ; Jie Jin ; Taehyung Park Article en page(s) : p. 19-26 Langues : Anglais (eng) Descripteurs : HE Vinci
RachisMots-clés : Spine Total Disc Replacement Remplacement total de disque Résumé : Background
Postoperative alterations in cervical spine curvature (i.e. loss of lordotic angle) are frequently observed following total disc replacement surgery. However, it remains unclear whether such changes in lordotic angle are due to preoperative spinal deformities and/or prostheses design limitations. The objective of the study is to investigate strain and segmental biomechanics of the malaligned cervical spine following total disc replacement.
Methods
Three disc prostheses were chosen, namely a metal-on-polyethylene, a metal-on-metal, and an elastomeric prosthesis, which feature different geometrical and material design characteristics. All discs were modelled and implanted into multi-segmental cervical spine finite element model (C3-C7) with normal, straight and kyphotic alignments. Comparative analyses were performed by using a hybrid protocol.
Findings
The results indicated that as the spine loses lordotic alignment, the prosthesis with elastomeric core tends to produce significantly larger flexion range of motion (difference up to 6.1°) than metal-on-polyethylene and metal-on-metal prostheses. In contrast, when the treated spine had normal lordotic alignment, the range of motion behaviors of different prostheses are rather similar (difference within 1.9°). Large localized strains up to 84.8% were found with the elastomeric prosthesis, causing a collapsed anterior disc space under flexion loads.
Interpretation
Changes in cervical spinal alignments could significantly affect the surgical-level range of motion behaviors following disc arthroplasty; the in situ performance was largely dependent on the designs of the artificial disc devices in particular to the material properties.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155925
in Clinical Biomechanics > Vol. 59 (2018) . - p. 19-26[article]Exemplaires (1)
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Titre : Contribution of minimally invasive bone augmentation to primary stabilization of the osteosynthesis of Schatzker type II tibial plateau fractures: Balloon vs bone tamp Type de document : Article Auteurs : T. Vendeuvre ; M. Grunberg ; A. Germaneau Article en page(s) : p. 27-33 Langues : Anglais (eng) Descripteurs : HE Vinci
Interventions chirurgicales mini-invasivesMots-clés : Tibial Fractures Fractures du tibia Schatzker type II Minimally Invasive Surgical Procedures Résumé : Background
Schatzker type II tibial plateau fractures necessitate the least invasive treatment possible. Arthroscopic reduction by bone tamp followed by osteosynthesis is the current gold standard for this type of tibial plateau fracture. The objective of this study was to compare this technique to anterior approach tuberoplasty with balloon reduction. The comparison criteria were residual articular step off, metaphyseal cavity volume formed during reduction, and mechanical strength to separation and to depression displacement.
Methods
Fractures were created on 12 human cadaveric tibiae and reduced by a minimally invasive approach in six specimens by a balloon, and by bone tamp in the six others. Articular step off and metaphyseal-epiphyseal cavity volume were measured by TDM. Mechanical tests were performed up to assembly failure to characterize structural strength. Secondary displacements, fracture depression displacement and separation were measured by optical methods.
Findings
There was no significant difference in step off measurement after balloon reduction or bone tamp (0.29 cm vs 0.37 cm; p = 0.06). The cavity volume formed by balloon reduction was significantly smaller than the volume created by bone tamp reduction (0.45 cm3 vs 5.12 cm; p = 0.002). The compressive load required for assembly failure was significantly greater in the balloon group than in the bone tamp group (1210.17 N vs 624.50 N; p = 0.015).
Interpretation
There exists a correlation between load to failure of the assembly frame and the metaphyseal volume required for bone fracture reduction. The minimally invasive balloon technique has fewer negative effects on the osseous stock, thereby enabling better primary structural strength of the fracture.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155926
in Clinical Biomechanics > Vol. 59 (2018) . - p. 27-33[article]Exemplaires (1)
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Titre : The effects of vibro-medical insole on sensation and plantar pressure distribution in diabetic patients with mild-to-moderate peripheral neuropathy Type de document : Article Auteurs : Masumeh Bagherzadeh Cham ; Mohammad Ali Mohseni-Bandpei ; Mahmood Bahramizadeh Article en page(s) : p. 34-39 Langues : Anglais (eng) Descripteurs : HE Vinci
Complications du diabète ; VibrationMots-clés : Diabetes Complications Peripheral Nervous System Diseases Neuropathies périphériques Stochastic Processes Processus stochastiques Foot Ulcer Ulcère du pied Résumé : Background
The first aim of this study was to determine the effect of a vibro-medical insole on pressure sensation and the second was to measure the effects of a vibro-medical insole with and without random noise on plantar pressure distribution in diabetic patients with mild-to-moderate peripheral neuropathy.
Methods
Twenty patients with mild-to-moderate diabetic neuropathy were recruited in the clinical trial pre-test, post-test study. A medical insole was made for each participant and a vibratory system was inserted into it. Pressure sensation was evaluated before and after the 30-min walk using the vibro-medical insole with added random noise by Semmes-Weinstein Monofilaments. Peak pressure data was measured before and after 30-min walking with a vibro-medical insole with and without random noise by the Pedar-x system.
Findings
Pressure sensations showed improvement after 30-min walking with the vibro-medical insole with added random noise at the heel, metatarsophalangeal heads and hallux of both feet in all participants (p Interpretation
Thirty minute walking with a vibro-medical insole seems to improve pressure sensation and alter peak pressure in diabetic patients with mild-to-moderate peripheral neuropathy. This work suggests that vibro-medical insoles can be used for daily living activities and possibly decreases the risk of ulceration in diabetic neuropathy patients.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155927
in Clinical Biomechanics > Vol. 59 (2018) . - p. 34-39[article]Exemplaires (1)
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Titre : Relative phase measures of intersegmental coordination describe motor control impairments in children with cerebral palsy who exhibit stiff-knee gait Type de document : Article Auteurs : James J. Carollo ; Kate Worster ; Zhaoxing Pan Article en page(s) : p. 40-46 Langues : Anglais (eng) Descripteurs : HE Vinci
Genou ; Paralysie cérébraleMots-clés : Cerebral Palsy Gait Démarche Knee Résumé : Background
The purpose of this retrospective study was to explore lower limb intersegmental coordination as a clinically important indicator of motor control mechanisms in individuals with cerebral palsy exhibiting stiff-knee gait. We used the relative phase of thigh and foot segments around foot-off to describe motor control, given the relevance of the pre-swing phase of gait to the existence of stiff-knee gait.
Methods
Traditional gait parameters and thigh/foot intersegmental coordination were calculated using pre-and postoperative kinematic data from a cohort of 54 subjects (92 legs) with spastic cerebral palsy. All participants had stiff-knee gait, walked without assistive devices, and underwent rectus femoris transfer surgery to improve swing period knee flexion. Analyses included correlations between a) preoperative intersegmental coordination and gait variables (knee flexion range, rate and gait performance) and b) pre-to-postoperative intersegmental coordination change and change in gait variables.
Findings
Thigh/foot intersegmental coordination significantly (P Interpretation
Intersegmental coordination is a clinically important factor in knee flexion limitations associated with stiff-knee gait for individuals with cerebral palsy. These findings are a foundation for further study of intersegmental coordination measures as complements to traditional instrumented gait analysis.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155928
in Clinical Biomechanics > Vol. 59 (2018) . - p. 40-46[article]Exemplaires (1)
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Titre : The effects of an articulated ankle-foot orthosis with resistance-adjustable joints on lower limb joint kinematics and kinetics during gait in individuals post-stroke Type de document : Article Auteurs : Toshiki Kobayashi ; Michael S. Orendurff ; Grace Hunt Article en page(s) : p. 47-55 Langues : Anglais (eng) Descripteurs : HE Vinci
Accident vasculaire cérébral (AVC)Mots-clés : Stroke Walk Test Test de marche Gait Démarche Foot Orthoses Orthèses de pied Résumé : Background
Resistance is a key mechanical property of an ankle-foot orthosis that affects gait in individuals post-stroke. Triple Action® joints allow independent adjustment of plantarflexion resistance and dorsiflexion resistance of an ankle-foot orthosis. Therefore, the aim of this study was to investigate the effects of incremental changes in dorsiflexion and plantarflexion resistance of an articulated ankle-foot orthosis with the Triple Action joints on lower limb joint kinematics and kinetics in individuals post-stroke during gait.
Methods
Gait analysis was performed on 10 individuals who were post-stroke under eight resistance settings (four plantarflexion and four dorsiflexion resistances) using the articulated ankle-foot orthosis. Kinematic and kinetic data of the lower limb joints were recorded while walking using a three-dimensional Vicon motion capture system and a Bertec split-belt instrumented treadmill.
Findings
Repeated measures analysis of variance revealed that adjustment of plantarflexion resistance had significant main effects on the ankle (P Interpretation
This study demonstrated that the adjustments of resistance in the ankle-foot orthosis with the Triple Action joints influenced ankle and knee kinematics in individuals post-stroke. Further work is necessary to investigate the long-term effects of the articulated ankle-foot orthoses on their gait.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155929
in Clinical Biomechanics > Vol. 59 (2018) . - p. 47-55[article]Exemplaires (1)
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Titre : Dimensional changes of the carpal tunnel and median nerve during manual mobilization of the carpal bones — Anatomical study Type de document : Article Auteurs : Elena Bueno-Gracia ; Albert Pérez-Bellmunt ; Carlos López-de-Celis Article en page(s) : p. 56-61 Langues : Anglais (eng) Descripteurs : HE Vinci
Syndrome du canal carpienMots-clés : Carpal Tunnel Syndrome Musculoskeletal Manipulations Manipulations de l'appareil locomoteur Résumé : Study design
Cross-sectional study.
Background
The carpal tunnel is a clinically important fibro-osseous conduit for the median nerve and associated tendons. It is mechanically dynamic and therapeutic manual techniques that appear to move and change tunnel shape is part of clinical practice.
Objectives
To measure changes in dimensions of the carpal tunnel and median nerve with manual mobilization of the carpal bones in cadavers.
Methods
A total of 20 cryopreserved upper extremities from cadaveric specimens were used in the study. The wrist was cut using an anatomical saw at the level of the pisiform. Measurements of the cross-sectional area (CSA), anteroposterior diameter (APD), transverse diameter (TD), perimeter, flattening ratio and circularity of the carpal tunnel and of the median nerve, were taken, both in the anatomical position of the wrist and during the mobilization technique of the carpal bones.
Results
During the mobilization technique, the tunnel CSA (p Conclusion
Application of external manually applied compressive force across the wrist can increase the CSA of the carpal tunnel and the median nerve in cadavers. These results are consistent with other studies in which similar results were found non-invasively using ultrasound.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155930
in Clinical Biomechanics > Vol. 59 (2018) . - p. 56-61[article]Exemplaires (1)
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Titre : Microclimate : A critical review in the context of pressure ulcer prevention Type de document : Article Auteurs : Jan Kottner ; Joyce Black ; Evan Call Article en page(s) : p. 62-70 Langues : Anglais (eng) Descripteurs : HE Vinci
Escarre ; Microclimat ; PeauMots-clés : Pressure Ulcer Epidermis Épiderme Microclimate Skin Résumé : Pressure ulcers are caused by sustained mechanical loading and deformation of the skin and subcutaneous layers between internal stiff anatomical structures and external surfaces or devices. In addition, the skin microclimate (temperature, humidity and airflow next to the skin surface) is an indirect pressure ulcer risk factor. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155931
in Clinical Biomechanics > Vol. 59 (2018) . - p. 62-70[article]Exemplaires (1)
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Titre : Co-activation is not altered in the contra-lateral limb of individuals with moderate knee osteoarthritis compared to healthy controls Type de document : Article Auteurs : Michelle Jones ; William Stanish ; Derek Rutherford Article en page(s) : p. 71-77 Langues : Anglais (eng) Descripteurs : HE Vinci
Electromyographie ; Epreuve d'effort ; GonarthroseMots-clés : Osteoarthritis Knee Gait Démarche Electromyography Exercise Test Biomechanical Phenomena Phénomènes biomécaniques Résumé : Background
Contra-lateral knee joint function in individuals with moderate knee osteoarthritis is not well understood, despite the functional burden of bilateral osteoarthritis on end stage clinical management. The purpose of this study was to determine whether co-activation and joint biomechanics are altered in the contra-lateral limb compared to age-matched controls.
Methods
20 Individuals with moderate knee osteoarthritis and 20 asymptomatic individuals walked on an instrumented dual belt treadmill at a self-selected speed. Surface electromyography of the knee joint musculature, including quadriceps, hamstrings and gastrocnemius muscles, normalized to maximum voluntary isometric contractions, as well as sagittal plane motion and sagittal and frontal plane moments were collected. Co-contraction indices were calculated and discrete variables from motion and moment data were extracted. Two-sample t-tests and 2-sample mixed model ANOVAs were performed with alpha Findings
Contra-lateral knee muscle co-activation differences were not found between groups (p > 0.65). Peak knee adduction moment (0.41 Nm/kg vs. 0.32 Nm/kg) and knee adduction moment impulse (0.14 Nm s/kg vs. 0.10 Nm s/kg) were higher in the contra-lateral limb compared to the asymptomatic group respectively, whereas the sagittal motion (9.8° vs. 14.4°) and moment ranges (0.66 Nm/kg vs. 0.86 Nm/kg) during stance were less dynamic (p Interpretation
The contra-lateral limb was functioning differently biomechanically despite no changes present in muscle co-activation. Findings suggest biomechanical changes are occurring without greater demand on the neuromuscular system to preserve contra-lateral joint function in moderate knee osteoarthritis gait. A greater focus should be made to address biomechanical abnormalities in both knees of individuals with moderate unilateral symptomatic knee osteoarthritis.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155932
in Clinical Biomechanics > Vol. 59 (2018) . - p. 71-77[article]Exemplaires (1)
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Titre : Bone remodelling of the humerus after a resurfacing and a stemless shoulder arthroplasty Type de document : Article Auteurs : B. Santos ; C. Quental ; J. Folgado Article en page(s) : p. 78-84 Langues : Anglais (eng) Descripteurs : HE Vinci
Remodelage osseuxMots-clés : Shoulder Joint Articulation glénohumérale Arthroplasty Replacement Shoulder Arthroplastie de l'épaule Bone Remodeling Résumé : Background
New implant designs, such as resurfacing and stemless implants, have been developed to improve the long-term outcomes of the shoulder arthroplasty. However, it is not yet fully understood if their influence on the bone load distribution can compromise the long-term stability of the implant due to bone mass changes. Using three-dimensional finite element models, the aim of the present study was to analyse the bone remodelling process of the humerus after the introduction of resurfacing and stemless implants based on the Global C.A.P. and Sidus Stem-Free designs, respectively.
Methods
The 3D geometric model of the humerus was generated from the CT data of the Visible Human Project and the resurfacing and stemless implants were modelled in Solidworks. Considering a native humerus model, a humerus model with the resurfacing implant, and a humerus model with the stemless implant, three finite element models were developed in Abaqus. Bone remodelling simulations were performed considering healthy and poor bone quality conditions. The loading condition considered comprised 6 load cases of standard shoulder movements, including muscle and joint reaction forces estimated by a multibody model of the upper limb.
Findings
The results showed similar levels of bone resorption for the resurfacing and stemless implants for common humeral regions. The regions underneath the head of the resurfacing implant, unique to this design, showed the largest bone loss. For both implants, bone resorption was more pronounced for the poor bone quality condition than for the healthy bone quality condition.
Interpretation
The stemless implant lost less density at the fixation site, which might suggest that these implants may be better supported in the long-term than the resurfacing implants. However, further investigation is necessary to allow definite recommendations.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155933
in Clinical Biomechanics > Vol. 59 (2018) . - p. 78-84[article]Exemplaires (1)
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Titre : Patterns of upper limb muscle activation in children with unilateral spastic cerebral palsy: Variability and detection of deviations Type de document : Article Auteurs : Aurélie Sarcher ; Sylvain Brochard ; François Hug Article en page(s) : p. 85-93 Langues : Anglais (eng) Descripteurs : HE Vinci
Electromyographie ; Membre supérieur ; Paralysie cérébraleMots-clés : Cerebral Palsy Upper Extremity Electromyography Résumé : Background
The aim of this study was two-fold: (1) to quantify the variability of upper limb electromyographic patterns during elbow movements in typically developing children and children with unilateral spastic cerebral palsy, and to compare different amplitude normalization methods; (2) to develop a method using this variability to detect (a) deviations in the patterns of a child with unilateral spastic cerebral palsy from the average patterns of typically developing children, and (b) changes after treatment to reduce muscle activation.
Methods
Twelve typically developing children ([6.7–15.9yo]; mean 11.0 SD 3.0yo) and six children with unilateral spastic cerebral palsy ([7.9–17.4yo]; mean 12.4 SD 4.0yo) attended two sessions during which they performed elbow extension-flexion and pronation-supination movements. Surface electromyography of the biceps, triceps, brachioradialis, pronator teres, pronator quadratus, and brachialis muscles was recorded. The Likelihood method was used to estimate the inter-trial, inter-session, and inter-subject variability of the electromyography patterns for each time point in the movement cycle. Deviations in muscle patterns from the patterns of typically developing children and changes following treatment were evaluated in a case study of a child with cerebral palsy.
Findings
Normalization of electromyographic amplitude by the mean peak yielded the lowest variability. The variability data were then used in the case study. This method detected higher levels of activation in specific muscles compared with typically developing children, and a reduction in muscle activation after botulinum toxin A injections.
Interpretation
Upper limb surface electromyography pattern analysis can be used for clinical applications in children with cerebral palsy.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155934
in Clinical Biomechanics > Vol. 59 (2018) . - p. 85-93[article]Exemplaires (1)
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Titre : Age and falls history effects on antagonist leg muscle coactivation during walking with balance perturbations Type de document : Article Auteurs : Jessica D. Thompson ; Prudence Plummer ; Jason R. Franz Article en page(s) : p. 94-100 Langues : Anglais (eng) Descripteurs : HE Vinci
Personne âgée fragile ; Sujet âgéMots-clés : Frail Elderly Aged Walking Marche à pied Postural Balance Équilibre postural Résumé : Background
Inspired by a reliance on visual feedback for movement control in older age, optical flow perturbations provide a unique opportunity to study the neuromuscular mechanisms involved in walking balance control, including aging and falls history effects on the response to environmental balance challenges. Specifically, antagonist leg muscle coactivation, which increases with age during walking, is considered a neuromuscular defense against age-associated deficits in balance control. The purpose of this study was to investigate the effects of age and falls history on antagonist leg muscle coactivation during walking with and without optical flow perturbations of different amplitudes.
Methods
Eleven young adults [mean (standard deviation) age: 24.8 (4.8) years], eleven older non-fallers [75.3 (5.4) years] and eleven older fallers [age: 78 (7.6) years] participated in this study. Participants completed 2-minute walking trials while watching a speed-matched virtual hallway that, in some conditions, included mediolateral optical flow perturbations designed to elicit the visual perception of imbalance.
Findings
We first found that lower leg antagonist muscle coactivation during normal walking increased with age, independent of falls history. We also found that older but not young adults increased antagonist leg muscle coactivation in the presence of optical flow perturbations, with more pervasive effects in older adults with a history of falls.
Interpretation
Our findings allude to a greater susceptibility to optical flow perturbations in older fallers during walking, which points to a higher potential for risk of instability in more complex and dynamic everyday environments. These findings may also have broader impacts related to the design of innovative training paradigms and neuromuscular targets for falls prevention.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155935
in Clinical Biomechanics > Vol. 59 (2018) . - p. 94-100[article]Exemplaires (1)
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Titre : Evaluating the primary stability of standard vs lateralised cementless femoral stems – A finite element study using a diverse patient cohort Type de document : Article Auteurs : Rami M.A. Al-Dirini ; Saulo Martelli ; Daniel Huff Article en page(s) : p. 101-109 Langues : Anglais (eng) Mots-clés : Arthroplasty Replacement Hip Arthroplastie prothétique de hanche Résumé : Background
Restoring the original femoral offset is desirable for total hip replacements as it preserves the original muscle lever arm and soft tissue tensions. This can be achieved through lateralised stems, however, the effect of variation in the hip centre offset on the primary stability remains unclear.
Methods
Finite element analysis was used to compare the primary stability of lateralised and standard designs for a cementless femoral stem (Corail®) across a representative cohort of male and female femora (N = 31 femora; age from 50 to 80 years old). Each femur model was implanted with three designs of the Corail® stem, each designed to achieve a different degree of lateralisation. An automated algorithm was used to select the size and position that achieve maximum metaphyseal fit for each of the designs. Joint contact and muscle forces simulating the peak forces during level gait and stair climbing were scaled to the body mass of each subject.
Findings
The study found that differences in restoring the native femoral offset introduce marginal differences in micromotion (differences in peak micromotion 3000 με) was achieved for some subjects when lateralized stems were used.
Interpretation
Findings of this study suggest that, with the appropriate size and alignment, the standard offset design is likely to be sufficient for primary stability, in most cases. Nonetheless, appropriate use of lateralised stems has the potential reduce the risk of peri-prosthetic bone damage. This highlights the importance of appropriate implant selection during the surgical planning stage.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155936
in Clinical Biomechanics > Vol. 59 (2018) . - p. 101-109[article]Exemplaires (1)
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Titre : Relationship between knee abduction moment with patellofemoral joint reaction force, stress and self-reported pain during stair descent in women with patellofemoral pain Type de document : Article Auteurs : Marina Cabral Waiteman ; Ronaldo Valdir Briani ; Marcella Ferraz Pazzinatto Article en page(s) : p. 110-116 Langues : Anglais (eng) Descripteurs : HE Vinci
Douleur ; Genou ; PainMots-clés : Knee Biomechanical Phenomena Phénomènes biomécaniques Résumé : Background
Increased external knee abduction moment has been proposed as a risk factor for patellofemoral pain. This alteration is thought to be associated with elevated patellofemoral joint reaction force and stress, however these relationships remain poorly explored. Therefore, this study aimed at comparing knee abduction moment parameters (peak, rate of moment development and impulse), patellofemoral joint reaction force and stress of women with patellofemoral pain and pain-free controls during stair descent; and investigating the relationship among these variables with self-reported pain.
Methods
Kinetic data was obtained by inverse-dynamics equations and a previously reported algorithmic model was used to determine patellofemoral joint reaction force and stress. Participants' worst pain in the last month and pain level during stair descent were evaluated using a visual analogue scale.
Findings
Women with patellofemoral pain presented higher peak, rate of moment development and impulse of the external knee abduction moment, patellofemoral joint reaction force and stress (p = 0.005 to 0.04, effect size = 0.52 to 0.96) during stair descent than pain-free controls. Only knee abduction moment impulse presented positive moderate correlations with worst pain level in the last month (r = 0.53, p Interpretation
These findings indicate that strategies aimed at decreasing external knee abduction moment impulse could reduce the load over the patellofemoral joint and improve pain of women with patellofemoral pain.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155937
in Clinical Biomechanics > Vol. 59 (2018) . - p. 110-116[article]Exemplaires (1)
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Titre : Effect of foot orthosis design on lower limb joint kinematics and kinetics during walking in flexible pes planovalgus : A systematic review and meta-analysis Type de document : Article Auteurs : Gauthier Desmyttere ; Maryam Hajizadeh ; Jacinte Bleau Article en page(s) : p. 117-129 Langues : Anglais (eng) Mots-clés : Flatfoot Pied plat Foot Orthoses Orthèses de pied Biomechanical Phenomena Phénomènes biomécaniques Résumé : Foot orthoses are commonly used for the management of excessive foot pronation in people with pes planovalgus. However, results are inconsistent due to variability in orthosis geometrical designs. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155938
in Clinical Biomechanics > Vol. 59 (2018) . - p. 117-129[article]Exemplaires (1)
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Titre : Changes in the ankle muscles co-activation pattern after 5 years following total ankle joint replacement Type de document : Article Auteurs : Carlos De La Fuente ; Eduardo Martinez-Valdes ; Carlos Cruz-Montecinos Article en page(s) : p. 130-135 Langues : Anglais (eng) Mots-clés : Arthroplasty Replacement Ankle Arthroplastie de remplacement de la cheville Walking Marche à pied Résumé : Background
The Hintegra® arthroplasty provides inversion-eversion stability, permits axial rotation, ankle flexion-extension, and improvements of the gait patterns are expected up to 12 months of rehabilitation. However, sensorimotor impairments are observed in ankle flexors/extensors muscles after rehabilitation, with potential negative effects on locomotion. Here we determined the timing and amplitude of co-activation of the tibialis anterior and medial gastrocnemius muscles during gait by assessing non-operated and operated legs of patients with total ankle replacement, 5 years after surgery.
Methods
Twenty-nine patients (age: 58 [5.5] years, height: 156.4 [6.5] cm, body mass: 72.9 [6.5] kg, 10 men, and 19 women) that underwent Hintegra® ankle arthroplasty were included. Inclusion criteria included 5 years prosthesis survivorship. The onset and offset of muscle activation (timing), as well as the amplitude of activation, were determined during barefoot walking at self-selected speed by surface electromyography. The timing, percentage, and index of co-activation between the tibialis anterior and medial gastrocnemius were quantified and compared between non-operated and operated legs.
Findings
The operated leg showed higher co-activation index and temporal overlapping between tibialis anterior and medial gastrocnemius during gait (p Interpretation
The neuromuscular changes developed during the process of degeneration do not appear to be restored 5 years following arthroplasty. The insertion of an ankle implant may restore anatomy and alignment but neuromuscular adaptations to degeneration are not corrected by 5 years following joint replacement.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155939
in Clinical Biomechanics > Vol. 59 (2018) . - p. 130-135[article]Exemplaires (1)
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Titre : High correlation between mechanical properties and bone mineral parameters in embalmed femurs after long-term storage Type de document : Article Auteurs : Bryan Wright ; Lydia Ragan ; Sanyalak Niratisairak Article en page(s) : p. 136-142 Langues : Anglais (eng) Descripteurs : HE Vinci
Densite osseuse ; FémurMots-clés : Bone Density Formaldehyde Formaldéhyde Résumé : Background
Fresh frozen human femurs are considered “the gold standard” in biomechanical studies of hip fractures, resembling the in vivo situation mostly. A more readily available alternative is formalin embalmed femurs. However, to which extent formalin affects key features of bone; its mechanical properties, bone mineral content and their mutual relationship over time, remains unknown. Accordingly, we measured the mineral parameters and related them to the mechanical properties of formalin fixed femurs after long-term storage.
Methods
36 paired femurs from human donors, fixed in formalin and stored for a mean period of 4.6 (3.5–6) years. Quantitative CT was performed to measure the bone mineral density and mass at the mainly cortical mid shaft and the center of the mainly cancellous condyles. Each pair was subjected to local tests by three-point bending and screw pullout of the shaft and lateral punch and metaphyseal cube compression of the condyles.
Findings
Neither mechanical nor bone mineral data were significantly correlated to storage time. Well-known associations for bone parameters with age and gender were retrieved. Maximum force of the cortical bone tests was highly correlated to the diaphyseal bone mass; (r = 0.80–0.87, p = 0.01), while maximum force of the cancellous bone tests correlated well to the density of the condylar bone; (r = 0.70, p = 0.01).
Interpretation
Our results indicate that mechanical and bone mineral data and their mutual relationship are conserved in formalin fixed femurs even after long-term storage. Formalin fixed femurs may serve as an alternative to fresh frozen femurs in biomechanical testing.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155940
in Clinical Biomechanics > Vol. 59 (2018) . - p. 136-142[article]Exemplaires (1)
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Titre : Kinematic differences between children with obstetric brachial plexus palsy and healthy controls while performing activities of daily living Type de document : Article Auteurs : Judy Mahon ; Ailish Malone ; Damien Kiernan Article en page(s) : p. 143-151 Langues : Anglais (eng) Descripteurs : HE Vinci
Activités de la vie quotidienne ; Enfant (6-12 ans) ; Plexus brachialMots-clés : Child Brachial Plexus Activities of Daily Living Résumé : Background
Residual shoulder dysfunction and deformity impacts on functional performance in children with obstetric brachial plexus palsy. Clinical understanding of upper limb dynamic movement patterns is difficult with observation alone. This case-control study describes the significant kinematic differences between children with obstetric brachial plexus palsy compared to typically developing children while performing tasks of the modified Mallet Scale.
Methods
Eleven children with obstetric brachial plexus palsy (mean 10 years, range 7–15 years, Narakas group I-III) and 10 typically developing children (mean 9 years 9 months, range 6–15 years) completed three-dimensional upper limb motion analysis using the acromion method to track dynamic scapular movement. Kinematic data were captured by a 4-CODA cx1 optoelectronic tracking system. Participants performed three trials of the modified Mallet scale tasks. Local coordinate systems, segment and joint rotations were defined as recommended by the International Society of Biomechanics.
Findings
Joint rotation angles against time of the glenohumeral, thoracohumeral and scapulohumeral joints were calculated. Kinematic findings demonstrated increased internal rotation in all postures, reduced glenohumeral excursion, habitual “trumpet” posture of glenohumeral abduction/elevation and variability in movement strategies. Scapulohumeral rhythm during abduction task was 1.88:1 in typically developing children and 1.04:1 in children with obstetric brachial plexus palsy.
Interpretation
Children with obstetric brachial plexus palsy demonstrate deficient external rotation in all tasks. Despite increased postural internal rotation, ability to move through internal rotation range is compromised. The glenohumeral joint showed the greatest range deficit, contributing to abnormal scapulohumeral rhythm. Future sub-group analysis of Narakas Classification is recommended.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155941
in Clinical Biomechanics > Vol. 59 (2018) . - p. 143-151[article]Exemplaires (1)
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Titre : Elastoplastic behavior of highly cross-linked and vitamin E-stabilized polyethylene – A biomechanical study Type de document : Article Auteurs : Yung-Chang Lu ; Cheng-Yu Wu ; Ting-Kuo Chang Article en page(s) : p. 152-158 Langues : Anglais (eng) Descripteurs : HE Vinci
Vitamine EMots-clés : Polyethylene Polyéthylène Vitamin E Biomechanical Phenomena Phénomènes biomécaniques Résumé : Background
Vitamin E-stabilized cross-linked polyethylene has been touted to alleviate the negative effects of oxidation. Although it has demonstrated significant improvements in wear resistance, bio-tribology, and oxidative resistance, little is known about the effect of antioxidants and dosage of cross-linking on the mechanical strength. This study aimed to evaluate the mechanical properties of these novel materials, which are commonly used in orthopedic implants.
Methods
Samples of different polymers were prepared with various levels of cross-linking and with or without vitamin E-stabilization and then tested according to ASTM D695 and D638. The elastoplastic characteristics under compression and tension were compared between the groups.
Findings
Vitamin E-stabilized cross-linked polyethylene showed a significant increase in elastic modulus over other groups, with a maximum increase of 26% in compression and 40% in tension when compared to the highly cross-linked group without vitamin E stabilization. The elastoplastic behavior under compression differed to that in tension for all polymers, demonstrating the anisotropic characteristics of these polymers.
Interpretation
The lower mechanical strength of highly cross-linked polyethylene has been a complication with the use of this polymer in orthopedic liners. This current study suggests that vitamin E-stabilized cross-linked polyethylene could be a suitable alternative material for knee implants because of its improved strength in resisting external forces.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155942
in Clinical Biomechanics > Vol. 59 (2018) . - p. 152-158[article]Exemplaires (1)
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Titre : The use of biofeedback for gait retraining : A mapping review Type de document : Article Auteurs : Linda M.A. van Gelder ; Andrew Barnes ; Jonathan S. Wheat Article en page(s) : p. 159-166 Langues : Anglais (eng) Mots-clés : Biofeedback Psychology Rétroaction biologique (psychologie) Gait Démarche Résumé : Biofeedback seems to be a promising tool to improve gait outcomes for both healthy individuals and patient groups. However, due to differences in study designs and outcome measurements, it remains uncertain how different forms of feedback affect gait outcomes. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155943
in Clinical Biomechanics > Vol. 59 (2018) . - p. 159-166[article]Exemplaires (1)
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Titre : Sex specific associations between biomechanical recovery and clinical recovery after total hip arthroplasty Type de document : Article Auteurs : Heather J. Brunner ; Kharma C. Foucher Article en page(s) : p. 167-173 Langues : Anglais (eng) Mots-clés : Gait Démarche Biomechanical Phenomena Phénomènes biomécaniques Recovery of Function Récupération fonctionnelle Arthroplasty Replacement Hip Arthroplastie prothétique de hanche Résumé : Background
There are sex-specific gait differences in men and women before and after total hip arthroplasty (THA) but we do not know their impact on clinical outcomes. The objective of this study was to identify sex-specific associations between pre- and postoperative changes in pain and function and (i) gait mechanics, (ii) passive range of motion, and (iii) abductor strength.
Methods
Pre- and one-year postoperative data were identified from a data repository (n = 124; 64 Women; Age 61 (SD 10); BMI 29 (SD 5)). We used linear regression analysis to identify sex-specific associations between Harris Hip Score pain and function subscores, and sagittal plane hip kinematics and 3D hip kinetics during gait, hip abductor strength, and passive hip range of motion (RoM).
Findings
Combinations of biomechanical variables predicted up to 24% of the variation in pain improvement and up to 27% of the variation in functional improvement. In men, increased peak external rotation moments were associated with pain improvement. Passive flexion RoM and peak extension moments were associated with functional improvement. In women, increased passive adduction RoM and peak external rotation moments were associated with pain improvement. Peak adduction moments and passive flexion RoM were associated with functional improvement.
Interpretations
The different associations between improvement in clinical outcomes and improvement in gait, passive RoM, and abductor strength suggest that the biomechanical path to recovery may be different in men and women.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155944
in Clinical Biomechanics > Vol. 59 (2018) . - p. 167-173[article]Exemplaires (1)
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Titre : Non-setting, injectable biomaterials containing particulate hydroxyapatite can increase primary stability of bone screws in cancellous bone Type de document : Article Auteurs : Jorge Solana Muñoz ; Ulrike Kettenberger ; Philip Procter Article en page(s) : p. 174-180 Langues : Anglais (eng) Descripteurs : HE Vinci
Densite osseuse ; OstéoporoseMots-clés : Bone Density Bone Screws Vis orthopédiques Hydrogel Osteoporosis Résumé : Background
Fracture fixation in weak bone is still a clinical challenge. Screw augmentation was shown to successfully increase their primary stability. The currently used calcium phosphate or polymeric bone cements, however, present important drawbacks such as induced toxicity and/or impaired bone neo-formation. A new approach to enhance bone screw primary stability without affecting bone formation is the use of non-setting, calcium phosphate loaded soft materials as the augmentation material.
Methods
Two types of biomaterials (non-crosslinked hyaluronic acid as viscous fluid and agar as hydrogel) were loaded with 40 wt/vol% of hydroxyapatite particles and characterized. The screw augmentation effect of all materials was evaluated through pull-out tests in bovine cancellous bone and compared to the non-augmented situation (control). The bone mineral density of each test sample was measured with μCT scans and was used to normalize the pull-out strength.
Findings
Both materials loaded with hydroxyapatite increased the normalized pull-out strength of the screws compared to control samples and particle-free materials. This counter-intuitive augmentation effect increased with decreasing bone mineral density and was independent from the type of the soft materials used.
Interpretation
We were able to demonstrate that non-setting, injectable biomaterials loaded with ceramic particles can significantly enhance the primary stability of bone screws. This material combination opens the unique possibility to achieve a screw augmentation effect without impairing or even potentially favoring the bone formation in proximity to the screw. This effect would be particularly advantageous for the treatment of osteoporotic bone fractures requiring a stabilization with bone screws.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155945
in Clinical Biomechanics > Vol. 59 (2018) . - p. 174-180[article]Exemplaires (1)
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Titre : Walking and balance in children and adolescents with lower-limb amputation : A review of literature Type de document : Article Auteurs : Arezoo Eshraghi ; Zahra Safaeepour ; Mark Daniel Geil Article en page(s) : p. 181-198 Langues : Anglais (eng) Descripteurs : HE Vinci
Adolescent ; Amputation ; Membre inférieur ; Mobilité réduite ; Prothèses et implants ; Rééducation et réadaptationMots-clés : Walking Marche à pied Amputation chirurgicale Lower Extremity Prostheses and Implants Gait Démarche Postural Balance Équilibre postural Mobility Limitation Résumé : Children with lower limb loss face gait and balance limitations. Prosthetic rehabilitation is thus aimed at improving functional capacity and mobility throughout the developmental phases of the child amputees. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155946
in Clinical Biomechanics > Vol. 59 (2018) . - p. 181-198[article]Exemplaires (1)
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Titre : Quadriceps-strengthening exercise and quadriceps and knee biomechanics during walking in knee osteoarthritis: A two-centre randomized controlled trial Type de document : Article Auteurs : Paul DeVita ; Jens Aaboe ; Cecilie Bartholdy Article en page(s) : p. 199-206 Langues : Anglais (eng) Descripteurs : HE Vinci
Douleur ; Force musculaire ; Genou ; PainMots-clés : Quadriceps Muscle Muscle quadriceps fémoral WOMAC Muscle Strength Knee Compressive Strength Résistance à la compression Résumé : Objective
To assess the effect of quadriceps strengthening on quadriceps muscle force, power, and work and tibio-femoral compressive loads during walking in adults with knee osteoarthritis.
Methods
Study design: Two-center, randomized, controlled trial. Intervention: Patients with knee osteoarthritis were randomly allocated to quadriceps strengthening program (3 times weekly) or no attention control group. Main outcome measures: Primary outcome was change from baseline in peak quadriceps force during walking at 12 weeks. Secondary outcomes included quadriceps power and work, knee compression forces during walking estimated with musculoskeletal modeling, muscle strength and pain and function. Outcomes were measured at baseline and 12 weeks.
Results
30 patients were randomized to receive either training (n = 15) or no attention (n = 15). At follow-up, there were no statistical differences between groups for maximum quadriceps force, quadriceps positive power, negative work, and positive work, and knee compressive force. Maximum negative quadriceps power in early stance was statistically significantly increased 36% in the training group compared to the control group which was most likely partially a response to faster walking velocity at follow-up. Muscle strength and patient reported pain and function were improved in the training group compared to the control group.
Conclusions
Quadriceps strength training leads to increased muscle strength and improved symptomatic and functional outcomes but does not change quadriceps or knee joint biomechanics during walking. The biomechanical mechanism of improved health with strength training in knee osteoarthritis patients remains unknown.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155947
in Clinical Biomechanics > Vol. 59 (2018) . - p. 199-206[article]Exemplaires (1)
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Titre : Scaption kinematics of reverse shoulder arthroplasty do not change after the sixth postoperative month Type de document : Article Auteurs : Keisuke Matsuki ; Hiroyuki Sugaya ; Shota Hoshika Article en page(s) : p. 1-6 Langues : Anglais (eng) Descripteurs : HE Vinci
Epaule ; Période postopératoireMots-clés : Biomechanical Phenomena Phénomènes biomécaniques Shoulder Arthroplasty Replacement Arthroplastie de l'épaule Postoperative Period Résumé : Background
Changes over time in shoulder kinematics and function after reverse shoulder arthroplasty have not been reported. The purpose of this study was to compare shoulder kinematics and function at 6 months and 1 year after reverse shoulder arthroplasty.
Methods
Twenty patients with a mean age of 74 years (range, 63–91 years) were enrolled in this study. Fluoroscopic images during scapular plane elevation were recorded at the mean of 6 months (range, 5–8 months) and 14 months (range, 11–21 months). CT-derived glenosphere models and computer-aided design humeral implant models were matched with the silhouette of the implants in the fluoroscopic images using model-image registration techniques. Glenosphere and humeral implant kinematics during scaption were compared between the two time points. Patients were also clinically examined with active range of motion and Constant score, and postoperative improvement in shoulder function were assessed.
Results
Active flexion and Constant score improved after surgery (p Interpretation
There was no significant additional improvement in either shoulder kinematics during scapular plane elevation or function between the sixth and twelfth postoperative months. We can assess kinematics at six months after reverse shoulder arthroplasty to determine how the shoulder will move. Clinically, treatment in the first six postoperative months should be emphasized to achieve better surgical outcomes.
Highlights
•We compared reverse shoulder kinematics and function between 6 months and 1 year.
•Shoulder function did not improve after 6 months.
•There were no differences in shoulder kinematics between 6 months and 1 year.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155904
in Clinical Biomechanics > Vol. 58 (2018) . - p. 1-6[article]Exemplaires (1)
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Titre : Immediate effect of scapula-focused exercises performed with kinematic biofeedback on scapular kinematics in individuals with subacromial pain syndrome Type de document : Article Auteurs : Gisele Harumi Hotta ; Paulo Otavio Pimenta Queiroz ; Tenysson Will de Lemos Article en page(s) : p. 7-13 Langues : Anglais (eng) Descripteurs : HE Vinci
Epaule ; Exercice physique ; Rééducation et réadaptation ; RétroactionMots-clés : Shoulder Impingement Syndrome Syndrome de conflit sous-acromial Biomechanical Phenomena Phénomènes biomécaniques Exercise Shoulder Résumé : Background
Given the changes in the patterns of muscular activation and scapular movement in individuals with subacromial pain syndrome, the use of neuromuscular training has been considered in rehabilitation protocols. There is currently no evidence of the effects of the use of three-dimensional (3D) kinematic biofeedback on individuals with subacromial pain syndrome. This study aimed to determine the immediate effect of scapular motor control exercises using 3D kinematic biofeedback on the scapular kinematics, inter-segment coordination and pain of individuals with subacromial pain syndrome.
Method
The kinematics of the scapulothoracic joint of 26 subjects with subacromial pain syndrome were assessed in the movement arm elevation and lowering in the sagittal plane before and after performance of three scapula-focused exercises using kinematic biofeedback. The individuals were familiarized with the selected exercises to acquire a greater scapular posterior tilt, while kinematic biofeedback, with visual and auditory stimuli, was used in real time. Scapular kinematics, pain, and subjective perception of exertion were the pre- and post-test measures.
Findings
In the movement of arm elevation and lowering, no differences were found in scapular tilt and on coordination between the segments pre- and post-test and the effect size was considered small.
Interpretation
Our results demonstrate that the performance of scapula-focused exercises using kinematic biofeedback does not cause immediate changes in the magnitude of scapular movement. However, inter-segmental coordination showed evidence of changes for scapular tilt in the lowering of the arm and internal rotation in the elevation and the lowering of the arm in individuals with subacromial pain syndrome.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155905
in Clinical Biomechanics > Vol. 58 (2018) . - p. 7-13[article]Exemplaires (1)
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Titre : Varus malalignment of cementless hip stems provides sufficient primary stability but highly increases distal strain distribution Type de document : Article Auteurs : Andreas Fottner ; Matthias Woiczinski ; Manuel Kistler Article en page(s) : p. 14-20 Langues : Anglais (eng) Mots-clés : Arthroplasty Replacement Hip Arthroplastie prothétique de hanche Sprains and Strains Entorses et foulures Hallux Varus Hallux varus Résumé : Background
Varus position of cementless stems is a common malalignment in total hip arthroplasty. Clinical studies have reported a low rate of aseptic loosening but an increased risk for thigh pain. This in vitro study aimed to evaluate these clinical observations from a biomechanical perspective.
Methods
A conventional cementless stem (CLS Spotorno) was implanted in a regular, straight (size 13.75) as well as in a varus position (size 11.25) in 6 composite femora (Sawbones), respectively. Primary stability was assessed by recording 3-dimensional micromotions under dynamic load bearing conditions and stress shielding was evaluated by registering the surface strain before and after stem insertion.
Findings
Primary stability for stems in varus malposition revealed significantly lower micromotions (p Interpretation
This biomechanical study confirms the clinical findings of a good primary stability of cementless stems in a varus malposition, but impressively demonstrates the altered load transmission with the risk for postoperative thigh pain.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155906
in Clinical Biomechanics > Vol. 58 (2018) . - p. 14-20[article]Exemplaires (1)
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Titre : Mechanomyography responses characterize altered muscle function during electrical stimulation-evoked cycling in individuals with spinal cord injury Type de document : Article Auteurs : Anamul Islam ; Nur Azah Hamzaid ; Morufu Olusola Ibitoye Article en page(s) : p. 21-27 Langues : Anglais (eng) Descripteurs : HE Vinci
Fatigue ; Traumatismes de la moelle épinièreMots-clés : Muscles Muscle Fatigue Fatigue musculaire Spinal Cord Injuries Electric Stimulation Stimulation électrique Résumé : Background
Investigation of muscle fatigue during functional electrical stimulation (FES)-evoked exercise in individuals with spinal cord injury using dynamometry has limited capability to characterize the fatigue state of individual muscles. Mechanomyography has the potential to represent the state of muscle function at the muscle level. This study sought to investigate surface mechanomyographic responses evoked from quadriceps muscles during FES-cycling, and to quantify its changes between pre- and post-fatiguing conditions in individuals with spinal cord injury.
Methods
Six individuals with chronic motor-complete spinal cord injury performed 30-min of sustained FES-leg cycling exercise on two days to induce muscle fatigue. Each participant performed maximum FES-evoked isometric knee extensions before and after the 30-min cycling to determine pre- and post- extension peak torque concomitant with mechanomyography changes.
Findings
Similar to extension peak torque, normalized root mean squared (RMS) and mean power frequency (MPF) of the mechanomyography signal significantly differed in muscle activities between pre- and post-FES-cycling for each quadriceps muscle (extension peak torque up to 69%; RMS up to 80%, and MPF up to 19%). Mechanomyographic-RMS showed significant reduction during cycling with acceptable between-days consistency (intra-class correlation coefficients, ICC = 0.51–0.91). The normalized MPF showed a weak association with FES-cycling duration (ICC = 0.08–0.23). During FES-cycling, the mechanomyographic-RMS revealed greater fatigue rate for rectus femoris and greater fatigue resistance for vastus medialis in spinal cord injured individuals.
Interpretation
Mechanomyographic-RMS may be a useful tool for examining real time muscle function of specific muscles during FES-evoked cycling in individuals with spinal cord injury.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155907
in Clinical Biomechanics > Vol. 58 (2018) . - p. 21-27[article]Exemplaires (1)
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Titre : Coordination stability between the legs is reduced after anterior cruciate ligament reconstruction Type de document : Article Auteurs : Cortney N. Armitano ; Steven Morrison ; Daniel M. Russell Article en page(s) : p. 28-33 Langues : Anglais (eng) Mots-clés : Anterior Cruciate Ligament Reconstruction Reconstruction du ligament croisé antérieur Gait Démarche Motor Skills Disorders Troubles des habiletés motrices Résumé : Background
The study was designed to examine coordination differences in walking between individuals with an anterior cruciate ligament reconstruction compared with healthy matched controls. Predictions from the extended Haken, Kelso, and Bunz coupled oscillator model were tested in these populations.
Methods
Seventeen persons with anterior cruciate ligament reconstruction and 17 matched controls participated in the study. Sagittal plane angular knee displacement was recorded using electrogoniometers over the lateral right and left knee joints while participants walked at five walking speeds overground. Coordination pattern and stability between the knees were quantified by mean and standard deviation of relative phase, respectively.
Findings
Mean relative phase was not influenced by walking speed or group. For both groups, coordination stability was maximal when individual's walked at their preferred gait speed. However, the anterior cruciate ligament reconstruction group demonstrated reduced coordination stability compared with healthy controls across the five speeds. Multiple regression analyses found that people with anterior cruciate ligament reconstruction who deviated more from antiphase coordination had decreased coordination stability.
Interpretation
Anterior cruciate ligament reconstruction results in decreased coordination stability, indicative of reduced coupling strength between the legs. This change in gait coordination, which has not previously been found in the literature, may contribute to the increased rate of re-injury and degeneration in individuals who have had this reconstructive surgery. Application of a motor control model enhances our understanding of the influence of an injury on coordination during gait.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155908
in Clinical Biomechanics > Vol. 58 (2018) . - p. 28-33[article]Exemplaires (1)
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Titre : Two-year gait analysis controls of the minimally invasive total hip arthroplasty by the direct anterior approach Type de document : Article Auteurs : Martin Thaler ; Ricarda Lechner ; David Putzer Article en page(s) : p. 34-38 Langues : Anglais (eng) Mots-clés : Arthroplasty Replacement Hip Arthroplastie prothétique de hanche Gait Démarche Résumé : Background
The purpose of the study was to determine the long-term functional outcome of two hip approaches by gait analysis. Patients were selected by prospective randomization, and operated on either by the anterolateral approach or by a minimally invasive direct anterior approach.
Methods
33 patients (17 anterolateral approach; 16 direct anterior approach) were analyzed using a Vicon 870 system. Gait analysis was performed two years after total hip arthroplasty. Temporo-spatial and kinematic variables were obtained.
Findings
On chest and pelvic kinematics, no patient group demonstrated significant differences. The time-distance parameters showed significant differences with the anterior approach in cadence and stride time.
Interpretation
The study indicates that the direct anterior approach exerts positive effects compared with the anterolateral approach two years after surgery. The muscle-sparing concept of direct anterior approach results in significant differences in gait compared to the anterolateral approach 2 years after surgery.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155909
in Clinical Biomechanics > Vol. 58 (2018) . - p. 34-38[article]Exemplaires (1)
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Titre : Is neuromuscular inhibition detectable in elite footballers during the Nordic hamstring exercise? Type de document : Article Auteurs : Lincoln Blandford ; Nicola Theis ; Ingrid Charvet Article en page(s) : p. 39-43 Langues : Anglais (eng) Descripteurs : HE Vinci
FootballMots-clés : Hamstring Muscles Muscles de la loge postérieure de la cuisse Hamstring Tendons Tendons des muscles ischio-jambiers Résumé : Background
The presence of neuromuscular inhibition following injury may explain the high incidence of biceps femoris injury recurrence in elite (soccer) footballers. This phenomenon may be detectable in elite players during the Nordic hamstring exercise. Thus, the first purpose of this study was to assess biceps femoris muscle activation during this exercise in players with hamstring injury history. Additionally, following injury, observed increases in synergistic muscle activation may represent a protective mechanism to the presence of neuromuscular inhibition. Thus, the second purpose was to identify if the relative contributions of biceps femoris, and its synergists reflected a post-injury pattern of activation suggestive of these potentially compensatory neural mechanisms.
Methods
Ten elite players with a history of hamstring injury and ten elite players without a history of hamstring injury, completed six repetitions of the Nordic hamstring exercise. During each trial, biceps femoris, semitendinosus and gluteus maximus muscle activations were collected at 90–30° and 30–0° of knee flexion.
Findings
Biceps femoris activation was significantly higher at 90–30° of knee flexion compared to 30–0° (P Interpretation
Neuromuscular inhibition of the biceps femoris was not detected during the exercise within elite footballers, yet the relative contributions of biceps femoris and its synergists appear to change following injury.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155910
in Clinical Biomechanics > Vol. 58 (2018) . - p. 39-43[article]Exemplaires (1)
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Titre : Two-dimensional frontal plane projection angle can identify subgroups of patellofemoral pain patients who demonstrate dynamic knee valgus Type de document : Article Auteurs : Craig R. Gwynne ; Sarah A. Curran Article en page(s) : p. 44-48 Langues : Anglais (eng) Descripteurs : HE Vinci
GenouMots-clés : Patellofemoral Pain Syndrome Syndrome fémoro patellaire Knee Biomechanical Phenomena Phénomènes biomécaniques Résumé : Background
Identifying individuals with patellofemoral pain who demonstrate similar modifiable factors including dynamic knee valgus may be useful in establishing subgroups of patients that can undergo individualised management strategies. However, a lack of objective assessment criteria means that the findings are of limited value to clinicians aiming to distinguish between patients with and without altered frontal plane knee kinematics. Therefore, the aim of the study was to investigate dynamic knee valgus in individuals with and without patellofemoral pain by determining frontal plane knee alignment during functional activity.
Methods
Thirty recreationally active individuals with patellofemoral pain and 30 non-injured individuals had frontal plane knee alignment assessed via two-dimensional analysis of the frontal plane projection angle during single limb stance and single limb squats to 60° of knee flexion.
Findings
Individuals with patellofemoral pain demonstrated excessive frontal plane knee alignment (P = .003; ES = 0.68) compared to uninjured participants during single limb squats. In addition, assessing frontal plane knee alignment using two-dimensional analysis had fair specificity and sensitivity of discriminating patellofemoral pain injury.
Interpretation
Clinical quantification of two-dimensional frontal plane knee alignment may be utilised to subgroup patients with patellofemoral pain that display dynamic knee valgus during single limb squats. Furthermore, this may be a useful clinical tool to determine individuals that may be at risk of developing pain in the future.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155911
in Clinical Biomechanics > Vol. 58 (2018) . - p. 44-48[article]Exemplaires (1)
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Titre : Comparison of aneurysmal and non-pathologic human ascending aortic tissue in shear Type de document : Article Auteurs : Henry W. Haslach ; Jenna Gipple ; Bradley Taylor Article en page(s) : p. 49-56 Langues : Anglais (eng) Descripteurs : HE Vinci
Relaxation ; StressMots-clés : Bone Cysts Aneurysmal Kystes osseux anévrismaux Résumé : Background
The mechanical properties of the aorta may provide some guidance to cardiovascular surgeons treating aortic disease. While tensile tests are traditional, recent work suggests that shear is important in aortic dissection. Characterizing the differences or similarities in the mechanical shear stress response of non-pathologic human ascending aortic tissue and of tissue that has remodeled to become aneurysmal contributes to understanding the differences in behavior of the two tissues.
Methods
Fresh non-pathological and aneurysmal tissue acquired from the operating room is deformed in translational shear at approximately physiological rates to 67% deformation followed by stress relaxation to allow comparison of their mechanical behavior. Aneurysmal tissue is tested at 1 mm/s or 12 mm/s and normal tissue at 12 mm/s. The deformation is either in the circumferential or longitudinal direction for a total of 48 specimens.
Findings
The shear response at 12 mm/s in non-pathological and aneurysmal tissue is similar in the circumferential direction but different in the longitudinal direction. Tissue type accounts for up to 30% of the variation in the longitudinal direction. The aneurysmal tissue response is rate-dependent. Both tissues exhibit significant shear stress relaxation.
Interpretation
Remodeling to create the aneurysm modifies the bond strength between collagen fibers and the extracellular matrix. The time-dependent response is probably due to interstitial fluid behavior. Thoracic surgeons must use caution in applying aortic stress values in the literature because they depend on the deformation rate.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155912
in Clinical Biomechanics > Vol. 58 (2018) . - p. 49-56[article]Exemplaires (1)
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Titre : Accelerations from wearable accelerometers reflect knee loading during running after anterior cruciate ligament reconstruction Type de document : Article Auteurs : Kathryn L. Havens ; Sarah C. Cohen ; Kristamarie A. Pratt Année de publication : 2018 Article en page(s) : p. 57-61 Langues : Anglais (eng) Descripteurs : HE Vinci
GenouMots-clés : Knee Anterior Cruciate Ligament Ligament croisé antérieur Running Course à pied Résumé : Background
Following anterior cruciate ligament reconstruction, individuals exhibit sagittal plane knee loading deficits as they underload their injured limb during running. These between-limb biomechanical differences are difficult to clinically detect. Wearable accelerometers may aid in the development of early rehabilitation programs to improve symmetrical loading. This study aimed to identify whether segment accelerations from wearable accelerometers can predict knee loading asymmetry in an anterior cruciate ligament reconstructed population.
Methods
14 individuals 5-months post-anterior cruciate ligament reconstruction performed self-selected speed running. Data were collected concurrently using a marker-based motion system and accelerometers positioned on participants' shanks and thighs. Stepwise linear regression was used to determine predictive value of accelerometer data on biomechanical variables.
Finding
Shank acceleration was not predictive of any biomechanical variable. Between-limb differences in thigh axial acceleration explained 30% of the variance in between-limb differences in knee power absorption (p = 0.045), suggesting that accelerometers placed on proximal joint segments may provide information regarding knee loading asymmetry. Between-limb differences in thigh axial acceleration also explained 38% of the variance in between-limb differences in ground reaction force (p = 0.002).
Interpretation
These relationships indicate that accelerations from wearable accelerometers may provide some useful information regarding knee loading during running in individuals following anterior cruciate ligament reconstruction.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155913
in Clinical Biomechanics > Vol. 58 (2018) . - p. 57-61[article]Exemplaires (1)
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Titre : Granulocyte-colony stimulating factor enhances bone fracture healing Type de document : Article Auteurs : Didier Moukoko ; Didier Pourquier ; Cécile Genovesio Article en page(s) : p. 62-68 Langues : Anglais (eng) Descripteurs : HE Vinci
HistologieMots-clés : Granulocyte Colony-Stimulating Factor Facteur de stimulation des colonies de granulocytes Fracture Healing Consolidation de fracture Histology Résumé : Background
Circulating mesenchymal stem cells contribute to bone repair. Their incorporation in fracture callus is correlated to their bioavailability. In addition, Granulocyte-colony stimulating factor induces the release of vascular and mesenchymal progenitors. We hypothesized that this glycoprotein stimulates fracture healing, and analyzed the effects of its administration at low doses on bone healing.
Methods
27 adult male Sprague-Dawley rats underwent mid-femur osteotomy stabilized by centromedullar pinning. In a post (pre) operative group, rats were subcutaneously injected with 5 μg/kg per day of Granulocyte-colony stimulating factor for 5 days after (before) surgery. In a control group, rats were injected with saline solution for 5 days immediately after surgery. A radiographic consolidation score was calculated. At day 35, femurs were studied histologically and underwent biomechanical tests.
Findings
5 weeks after surgery, mean radiographic scores were significantly higher in the Preop group 7.75 (SD 0.42) and in the Postop group 7.67 (SD 0.52) than in the control group 6.75 (SD 0.69). Biomechanical tests showed femur stiffness to be more than three times higher in both the Preop 109.24 N/mm (SD 51.86) and Postop groups 100.05 N/mm (SD 60.24) than in control 32.01 N/mm (SD 15.78). Mean maximal failure force was twice as high in the Preop group 68.66 N (SD 27.78) as in the control group 34.21 N (SD 11.79). Histological results indicated a later consolidation process in control than in treated groups.
Interpretation
Granulocyte-colony stimulating factor injections strongly stimulated early femur fracture healing, indicating its potential utility in human clinical situations such as programmed osteotomy and fracture.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155914
in Clinical Biomechanics > Vol. 58 (2018) . - p. 62-68[article]Exemplaires (1)
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Titre : Quantifying the force transmission through the pelvic joints during total hip arthroplasty: A pilot cadaveric study Type de document : Article Auteurs : Matthew W. Bullock ; Michael De Gregorio ; Kerry A. Danelson Article en page(s) : p. 69-73 Langues : Anglais (eng) Mots-clés : Arthroplasty Replacement Hip Arthroplastie prothétique de hanche Acetabulum Acétabulum Sacroiliac Joint Articulation sacro-iliaque Résumé : Background
Total hip arthroplasty is one of the most successful and cost effective procedures in orthopedics. The purpose of this study is to investigate force transmission through the sacroiliac joint as a possible source of post-operative pain after total hip arthroplasty through the following three questions: Does the ipsilateral sacroiliac joint, contralateral sacroiliac joint, or pubic symphysis experience more force during placement? Does the larger mallet used to seat the implant generate a higher force? Does the specimen's bone density or BMI alter force transmission?
Methods
A solid design acetabular component was impacted into five human cadaver pelves with intact soft tissues. The pressure at both sacroiliac joints and the pubic symphysis was measured during cup placement. This same procedure was replicated using an existing pelvis finite element model to use for comparison.
Findings
The location of the peak force for each hammer strike was found to be specimen specific. The finite model results indicated the ipsilateral sacroiliac joint had the highest pressure and strain followed by the pubic symphysis over the course of the full simulation. The heft of the mallet and bone mineral density did not predict force values or locations. The largest median force was generated in extremely obese specimens.
Interpretation
Contrary to previous ideas, it is highly unlikely that forces experienced at the pelvic joints are large enough to contribute post-operative pain during impaction of an acetabular component. These results indicate more force is conveyed to the pubic symphysis compared to the sacroiliac joints.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155915
in Clinical Biomechanics > Vol. 58 (2018) . - p. 69-73[article]Exemplaires (1)
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Titre : Patient-specific finite element analysis of femurs with cemented hip implants Type de document : Article Auteurs : Yekutiel Katz ; Omri Lubovsky ; Zohar Yosibash Article en page(s) : p. 74-89 Langues : Anglais (eng) Descripteurs : HE Vinci
FémurMots-clés : Arthroplasty Replacement Hip Arthroplastie prothétique de hanche Résumé : Background
Over 1.6 million hip replacements are performed annually in Organisation for Economic Cooperation and Development countries, half of which involve cemented implants. Quantitative computer tomography based finite element methods may be used to assess the change in strain field in a femur following such a hip replacement, and thus determine a patient-specific optimal implant. A combined experimental-computational study on fresh frozen human femurs with different cemented implants is documented, aimed at verifying and validating the methods.
Methods
Ex-vivo experiments on four fresh-frozen human femurs were conducted. Femurs were scanned, fractured in a stance position loading, and thereafter implanted with four different prostheses. All femurs were reloaded in stance positions at three different inclination angles while recording strains on bones' and prosthesis' surfaces. High-order FE models of the intact and implanted femurs were generated based on the computer tomography scans and X-ray radiographs. The models were virtually loaded mimicking the experimental conditions and FE results were compared to experimental observations.
Findings
Strains predicted by finite element analyses in all four femurs were in excellent correlation with experimental observations FE = 1.01 * EXP − 0.07,R2 = 0.976, independent of implant's type, loading angle and fracture location.
Interpretation
Computer tomography based finite element models can reliably determine strains on femur surface and on inserted implants at the contact with the cement. This allows to investigate suitable norms to rank implants for a patient-specific femur so to minimize changes in strain patterns in the operated femur.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155916
in Clinical Biomechanics > Vol. 58 (2018) . - p. 74-89[article]Exemplaires (1)
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Titre : Movement variability in adults with low back pain during sit-to-stand-to-sit Type de document : Article Auteurs : Patrick Ippersiel ; Shawn Robbins ; Richard Preuss Article en page(s) : p. 90-95 Langues : Anglais (eng) Descripteurs : HE Vinci
Lombalgie ; Mouvement du corps ; PostureMots-clés : Low Back Pain Movement Résumé : Background
Differences in movement variability may be related to a guarded response to pain or a less robust movement pattern, indicating a potential dysfunction in motor control. The study objective was to compare patterns of lumbo-pelvic coordinative variability, during repeated sit-to-stand-to-sit, in individuals with low back pain and healthy adults.
Methods
Participants were adults with low back pain (n = 16) and healthy controls (n = 21). Kinematics for the T12-L3, L3-S1, and hip segments were measured using electromagnetic motion capture during 10 sit-to-stand-to-sit trials. Continuous relative phase analysis using the Hilbert transform method determined coordination and variability of the Hip-L3S1, and L3S1-T12L3 segments, deconstructed into 4 periods (start/up/down/end). T-tests compared coordination and variability of the full task between groups, and a mixed ANOVA compared the effects of group and period for the two segments.
Findings
Across the full task, the low back pain group demonstrated more variable (mean difference = −6.95, 95% CI = −12.3 to −1.59) and greater out-of-phase behavior (mean difference = −22.6, 95% CI = −39.1 to −6.03) in the LHip-L3S1 segment. Group-period interaction effects revealed greater variability in the start period (mean difference = −0.325, 95% CI = −0.493 to −0.156) and more out-of-phase behavior in the start (mean difference = −0.350, 95% CI = −0.549 to −0.150) and end (mean difference = −0.354, 95% CI = −0.602 to −0.105) periods for the LHip-L3S1 segment.
Interpretation
Excessive variability may relate to reports of poor spinal proprioception in low back pain; however, based on our sample characteristics (low pain and disability) and lack of symptoms during the task, classifying our findings as dysfunctional may not be fully warranted.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155917
in Clinical Biomechanics > Vol. 58 (2018) . - p. 90-95[article]Exemplaires (1)
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Titre : Combining acetabular and femoral morphology improves our understanding of the down syndrome hip Type de document : Article Auteurs : Ziad Bakouny ; Ayman Assi ; Fares Yared Article en page(s) : p. 96-102 Langues : Anglais (eng) Descripteurs : HE Vinci
Hanche ; PostureMots-clés : Down Syndrome Syndrome de Down Imaging Three-Dimensional Imagerie tridimensionnelle Hip Résumé : Background
Hip instability is frequent in patients with Down syndrome. Recent studies have suggested that skeletal hip alterations are responsible for this instability; however, there are currently no studies simultaneously assessing femoral and acetabular anatomy in subjects with Down syndrome in the standing position. The aim was to analyze the three-dimensional anatomy of the Down syndrome hip in standing position.
Methods
Down syndrome subjects were age and sex-matched to asymptomatic controls. All subjects underwent full body biplanar X-rays with three-dimensional reconstructions of their pelvises and lower limbs. Parameter means and distributions were compared between the two groups.
Findings
Forty-one Down syndrome and 41 control subjects were recruited. Acetabular abduction (mean = 52° [SD = 9°] vs. mean = 56° [SD = 8°]) and anteversion (mean = 14° [SD = 8°] vs. mean = 17.5° [SD = 5°]) as well as posterior acetabular sector angle (mean = 91° [SD = 7°] vs. mean = 94° [SD = 7°]) were significantly lower in Down syndrome subjects compared to controls (P Interpretation
Subjects with Down syndrome were found to have a significantly altered and more heterogeneous anatomy of their proximal hips compared to controls. This heterogeneity suggests that treatment strategies of hip instability in Down syndrome should be subject-specific and should rely on the understanding of the underlying three-dimensional anatomy of each patient.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155918
in Clinical Biomechanics > Vol. 58 (2018) . - p. 96-102[article]Exemplaires (1)
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Titre : Prevalence and predictors for the ability to run in children and adolescents with cerebral palsy Type de document : Article Auteurs : Harald Bohm ; Philipp Wanner ; Roman Rethwilm Article en page(s) : p. 103-108 Langues : Anglais (eng) Descripteurs : HE Vinci
Paralysie cérébraleMots-clés : Running Course à pied Gait Démarche Cerebral Palsy Résumé : Background
Running is a fundamental movement skill and a prerequisite for children to participate in numerous daily activities. The prevalence of the ability to run in people with Cerebral Palsy and the role of their impairments on running ability are unknown. Therefore, the aim of this study is to determine the prevalence of the ability to run and to identify contributing factors.
Methods
In this study, 280 children and adolescents with spastic Cerebral Palsy, Gross Motor Function Classification System level II were included. The ability to run was defined by instrumented running analysis. Runners and non-runners were compared regarding their clinical measures of spasticity, weakness, and postural control. Logistic regression was applied to identify the most important predictors for the ability to run.
Findings
The ability to run was significantly higher in unilateral (67%) than in bilateral (55%) affected patients. Significant differences between runners and non-runners were found for spasticity, BMI and postural control, but not for muscle strength. Lower M. rectus femoris spasticity, higher m gastrocnemius spasticity and enhanced postural control appear to be the best predictors for being able to run.
Interpretation
Patients with Gross Motor Function Classification System level II represent a large group in the gait laboratory and the functional impairment within this group differs greatly. Therefore, for clinical decision making we suggest to separate patients in this group based on their running ability. Spasticity and postural control affect the ability to run and needs to be accounted for in intervention programs.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155919
in Clinical Biomechanics > Vol. 58 (2018) . - p. 103-108[article]Exemplaires (1)
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Titre : Investigation of the hemodynamics of a juxtarenal aortic aneurysm with intervention by dual-stents strategy Type de document : Article Auteurs : Li Zhongyou ; Jiang Wentao ; Yuan Ding Article en page(s) : p. 109-115 Langues : Anglais (eng) Descripteurs : HE Vinci
HemodynamiqueMots-clés : Hemodynamics Juxtarenal aortic aneurysm Anévrisme aortique juxtarenal Résumé : Objective
To study the feasibility of using two stents (a combination of multilayer stent [MS] and stent graft [SG]) in the treatment of a juxtarenal aortic aneurysm that involves a significant branch artery and to determine the advantages and disadvantages of using SGs upstream and downstream from the aneurysm so as to provide some theoretical guidance for preoperative clinical decision-making in the future.
Methods
Four ideal geometric models were established for numerical computation: case 1 refers to an aneurysm without the use of stents, case 2 represents the implantation of two MSs in an aneurysm, and case 3 (SG + MS) and case 4 (MS + SG) both involve the treatment of an aneurysm by using a combination of SG and MG.
Results
The aneurysm pressure is slightly lower and there are more vortices when the SG is implanted (case 3 and case 4). In particular, for case 4, additional vortices appear in the sac and the area of the low-wall shear stress is larger on the aneurysm compared with those of the other three cases. However, the pressure becomes uneven, and a peak pressure region is observed on the wall of the aneurysm, and therefore, the aneurysmal wall will become buckled. In addition, the flux of the renal artery in the four cases is greater than that in the normal case.
Conclusion
The arrangements in cases 3 and 4 can effectively isolate the aneurysm from circulation, but clinically, it is necessary to avoid such a high-risk situation wherein the SG is positioned downstream of the aneurysm (case 4), even though this leads to improved isolation.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155920
in Clinical Biomechanics > Vol. 58 (2018) . - p. 109-115[article]Exemplaires (1)
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Titre : Functional assessment and satisfaction of transfemoral amputees with low mobility (FASTK2): A clinical trial of microprocessor-controlled vs. non-microprocessor-controlled knees Type de document : Article Auteurs : Kenton R. Kaufman ; Kathie A. Bernhardt ; Kevin Symms Article en page(s) : p. 116-122 Langues : Anglais (eng) Descripteurs : HE Vinci
Amputés ; Locomotion ; Prothèse de genou ; Qualité de vieMots-clés : Amputees Quality of Life Knee Prosthesis Treatment Outcome Résultat thérapeutique Microcomputers Micro-ordinateurs Résumé : Background
The benefits of a microprocessor-controlled knee are well documented in transfemoral amputees who are unlimited community ambulators. There have been suggestions that transfemoral amputees with limited community ambulation will also benefit from a microprocessor-controlled knee. Current medical policy restricts microprocessor-controlled knees to unlimited community ambulators and, thereby, potentially limits function. This clinical trial was performed to determine if limited community ambulators would benefit from a microprocessor-controlled knee.
Methods
50 unilateral transfemoral amputees, mean age 69, were tested using their current non-microprocessor-controlled knee, fit with a microprocessor-controlled knee and allowed 10 weeks of acclimation before being tested, and then retested with their original mechanical knee after 4 weeks of re-acclimation. Patient function was assessed in the free-living environment using tri-axial accelerometers. Patient satisfaction and safety were also measured.
Findings
The subjects demonstrated improved outcomes when using the microprocessor-controlled knee. Subjects had a significant reduction in falls, spent less time sitting, and increased their activity level. Subjects also reported significantly better ambulation, improved appearance, and greater utility.
Interpretation
This clinical trial demonstrated that transfemoral amputees with limited mobility clearly benefit from a microprocessor-controlled knee. Notably, a reduction in falls occurred while the subjects engaged in more physical activity, which resulted in increased subject satisfaction. The increased activity resulted in a greater exposure to fall risk, but that risk was moderated by the advanced technology.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155921
in Clinical Biomechanics > Vol. 58 (2018) . - p. 116-122[article]Exemplaires (1)
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Titre : Potential enhancement of articular cartilage histological grading with collagen integrity Type de document : Article Auteurs : Hayley R. Moody ; Isaac O. Afara ; Sanjleena Singh ; [et al.] Article en page(s) : p. 1-10 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.04.016 Langues : Anglais (eng) Descripteurs : HE Vinci
Arthrose ; CartilageMots-clés : Articular Cartilage articulaire Collagen Collagène Osteoarthritis Fibrillar Collagens Collagènes fibrillaires Résumé : istological evaluation of articular cartilage, such as using the Mankin scoring system, is the gold standard for characterization of tissue integrity. This scoring system takes into account several parameters indicative of the tissue's health; however, the collagen integrity, which is a primary indicator of cartilage health is not taken into consideration. Thus, there is need to enhance histological grading of articular cartilage by incorporating explicit scoring of collagen degeneration into the Modified Mankin grading system. This paper explores a new histological grading parameter for collagen network degradation and how this information can be used to augment a widely used grading scheme like the Modified Mankin grading system.
Methods
Intact and degenerated human cartilage were examined histologically and then subjected to second harmonic generation imaging, leading to qualitative and quantitative description of collagen disruption emanating from the surface to subsurface layers of the tissue. This data was then incorporated into the Modified Mankin grading system.
Findings
Second harmonic generation image analysis reveals a relationship between changes in collagen architecture and histologically observed tissue disruption in degenerated articular cartilage.
Interpretation
Histological tissue disruption in degenerated human articular cartilage is directly related to the reorganization of collagen fibrils in the form of intense fibril aggregation, either as a result of degeneration or aging. This method of mapping disrupted tissue regions to quantitative collagen fibril damage can be coded into cartilage grading systems and could inform clinical practice and scientific research.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155875
in Clinical Biomechanics > Vol. 56 (July 2018) . - p. 1-10[article]Exemplaires (1)
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Titre : Digital tracking algorithm reveals the influence of structural irregularities on joint movements in the human cervical spine Type de document : Article Auteurs : Christian Balkovec, Auteur ; Jim Veldhuis, Auteur ; John W. Baird, Auteur ; [et al.], Auteur Article en page(s) : p. 11-17 Langues : Anglais (eng) Mots-clés : Intervertebral Disc Disque intervertébral Osteophyte Ostéophyte Fluoroscopy Radioscopie Résumé : Disc height loss osteophytes change the local mechanical environment in the spine;while previous research has examined kinematic dysfunction under degenerative change, none has looked at the influence of disc height loss and osteophytes throught movement. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155876
in Clinical Biomechanics > Vol. 56 (July 2018) . - p. 11-17[article]Exemplaires (1)
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Titre : A new methodology based on functional principal component analysis to study postural stability post-stroke Type de document : Article Auteurs : Luz M. Sanchez-Sanchez, Auteur ; Juan-Manuel Belda-Lois, Auteur ; Silvia Mena-del Horno, Auteur ; [et al.], Auteur Article en page(s) : p. 18-26 Langues : Anglais (eng) Descripteurs : HE Vinci
Accident vasculaire cérébral (AVC) ; Rééducation et réadaptationMots-clés : Stroke Postural Balance Équilibre postural Facial Hemiatrophy Hémiatrophie faciale Physical Therapy Modalities Techniques de physiothérapie Résumé : A major goal in stroke rehabilitation is the establishment of more effective physical therapy techniques to recover postural stability. Functional Principal Component Analysis provides greater insight into recovery trends. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155877
in Clinical Biomechanics > Vol. 56 (July 2018) . - p. 18-26[article]Exemplaires (1)
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Titre : Utility of cement injection to stabilize split-depression tibial plateau fracture by minimally invasive methods : A finite element analysis Type de document : Article Auteurs : D. Belaid ; T. Vendeuvre ; A. Bouchoucha ; [et al.] Article en page(s) : p. 27-35 Langues : Anglais (eng) Descripteurs : HE Vinci
Interventions chirurgicales mini-invasivesMots-clés : Tibial Fractures Fractures du tibia Finite Element Analysis Analyse des éléments finis Minimally Invasive Surgical Procedures Résumé : Treatment for fractures of the tibial plateau is in most cases carried out by stable fixation in order to allow early mobilization. Minimally invasive technologies such as tibioplasty or stabilization by locking plate, bone augmentation and cement filling (CF) have recently been used to treat this type of fracture. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155878
in Clinical Biomechanics > Vol. 56 (July 2018) . - p. 27-35[article]Exemplaires (1)
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Titre : Autologous bridging of rotator cuff tears with a hamstring tendon patch. A cadaver feasibility study and biomechanical testing Type de document : Article Auteurs : Jörn Kircher ; Felix Schmidt ; Thelonius Hawellek Article en page(s) : p. 36-39 Langues : Anglais (eng) Descripteurs : HE Vinci
Transplantation ; Transplantation autologueMots-clés : Rotator Cuff Coiffe des rotateurs Rotator Cuff Tear Arthropathy Arthropathie de rupture de la coiffe des rotateurs Hamstring Tendons Tendons des muscles ischio-jambiers Autologous Biomechanical Phenomena Phénomènes biomécaniques Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155879
in Clinical Biomechanics > Vol. 56 (July 2018) . - p. 36-39[article]Exemplaires (1)
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Titre : Comparative biomechanical study of a new transpedicular vertebral device and vertebroplasty for the treatment or prevention of vertebral compression fractures Type de document : Article Auteurs : Max Aebi ; Charlène Maas ; Theodor Di Pauli von Treuheim ; [et al.] Article en page(s) : p. 40-45 Langues : Anglais (eng) Descripteurs : HE Vinci
OstéoporoseMots-clés : Vertebroplasty Vertébroplastie Osteoporosis Fractures Compression Fractures par compression Résumé : A comparative study was performed between a novel transpedicular implant (V-STRUT), Hyprevention, France) and vertebroplasty. This study aims to access the biomechanical efficacy of this implant in resurrecting and fortifying the osteoporotic vertebra following a vertebral body fracture. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155880
in Clinical Biomechanics > Vol. 56 (July 2018) . - p. 40-45[article]Exemplaires (1)
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Titre : In-vivo stiffness assessment of distal femur fracture locked plating constructs Type de document : Article Auteurs : Christopher Parks ; Christopher M. McAndrew ; Amanda Spraggs-Hughes Article en page(s) : p. 46-51 Langues : Anglais (eng) Descripteurs : HE Vinci
FémurMots-clés : Femoral Fractures Fractures du fémur stiffness Rigidité vasculaire Bone Plates Plaques orthopédiques Résumé : The purpose of this study was to design and validate a novel stiffness-measuring device using locked plating of distal femur fractures as a model. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155881
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Titre : Design and clinical outcome of a novel 3D-printed prosthetic joint replacement for the human temporomandibular joint Type de document : Article Auteurs : David Ackland ; Dale Robinson ; Peter Vee Sin Lee Article en page(s) : p. 52-60 Langues : Anglais (eng) Descripteurs : HE Vinci
Impression tridimensionnelle ; MachoireMots-clés : Jaw Biomechanical Phenomena Phénomènes biomécaniques Printing Three-Dimensional Mandibular Prosthesis Prothèse mandibulaire Résumé : Stock prosthetic temporomandibular joint replacements come in limited sizes, and do not always encompass the joint anatomy that presents clinically. The aims of this study were twofold. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155882
in Clinical Biomechanics > Vol. 56 (July 2018) . - p. 52-60[article]Exemplaires (1)
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Titre : Low-dimensional dynamical characterization of human performance of cancer patients using motion data Type de document : Article Auteurs : Zaki Hasnain ; Ming Li ; Tanya Dorff ; [et al.] Article en page(s) : p. 61-69 Langues : Anglais (eng) Descripteurs : HE Vinci
Fatigue ; TumeursMots-clés : Motion Perception Perception du mouvement Physical Fitness Aptitude physique Résumé : Biomechanical characterization of human performance with respect to fatigue and fitness is relevant in many setting, however is usually limited to either fully qualitative assessments or invasive methods which require a significant experimental setup consisting of numerous sensors, force plates, and motion detectors. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155883
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Titre : Trunk forward flexion mobility in reference to postural sway in women after delivery : A prospective longitudinal comparison between early pregnancy and 2- and 6- month postpartum follow-ups Type de document : Article Auteurs : Agnieszka Opala-Berdzik ; Janusz W. Blaszczyk ; Dariusz Swider ; [et al.] Article en page(s) : p. 70-74 Langues : Anglais (eng) Descripteurs : HE Vinci
Grossesse ; PostureMots-clés : Pregnancy Postpartum Period Période du postpartum Postural Balance Équilibre postural Résumé : It has been documented that pregnancy-related increased connective tissue laxity may persist postpartum; however, it is still unclear for how long. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155884
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Titre : American Society of Biomechanics Clinical Biomechanics Award 2017 : Non-anatomic graft geometry is linked with asymmetric tibiofemoral kinematics and cartilage contact following anterior cruciate ligament reconstruction Type de document : Article Auteurs : Michael F. Vignos ; Jarred M. Kaiser ; Geoffrey S. Baer ; [et al.] Article en page(s) : p. 75-83 Langues : Anglais (eng) Descripteurs : HE Vinci
Arthrose ; Cartilage ; GenouMots-clés : Knee Anterior Cruciate Ligament Reconstruction Reconstruction du ligament croisé antérieur Osteoarthritis Biomechanical Phenomena Phénomènes biomécaniques Bone-Patellar Tendon-Bone Grafts Greffes os-tendon rotulien-os Résumé : Abnormal knee mechanics may contribute to early cartilage degeneration following anterior cruciate ligament reconstruction. Anterior cruciate ligament graft geometry has previously been linked to abnormal tibiofemoral kinematics, suggesting this parameter may be important in restoring normative cartilage loading. However, the relationship between graft geometry and cartilage contact is unknow. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155885
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Titre : Effects of diabetic peripheral neuropathy on gait in vascular trans-tibial amputees Type de document : Article Auteurs : Hiroshi Nakajima ; Sumiko Yamamoto ; Junji Katsuhira Article en page(s) : p. 84-89 Langues : Anglais (eng) Descripteurs : HE Vinci
Amputés ; Neuropathies diabétiquesMots-clés : Diabetic Neuropathies Amputees Peripheral Vascular Diseases Maladies vasculaires périphériques Gait Démarche Biomechanical Phenomena Phénomènes biomécaniques Résumé : Patients with diabetes often develop diabetic peripheral neuropathy, wich is a distal symmetric polyneuropathy, so ffot function on the non-amputated side is expected to affect gait in vascular trans-tibial amputees. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155886
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| Cote | Support | Localisation | Section | Disponibilité |
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Titre : Headless compression screw for horizontal medical malleolus fractures Type de document : Article Auteurs : Robin Z. Cheng ; Adam M. Wegner ; Anthony W. Behn Article en page(s) : p. 1-6 Langues : Anglais (eng) Mots-clés : Ankle Fractures Fractures de la cheville Biomechanical Phenomena Phénomènes biomécaniques Internal Fixators Fixateurs internes Résumé : Background
Horizontal medial malleolus fractures are caused by the application of rotational force through the ankle joint in several orientations. Multiple techniques are available for the fixation of medial malleolar fractures.
Methods
Horizontal medial malleolus osteotomies were performed in eighteen synthetic distal tibiae and randomized into two fixation groups: 1) two parallel unicortical cancellous screws or 2) two Acutrak 2 headless compression screws. Specimens were subjected to offset axial tension loading. Frontal plane interfragmentary motion was monitored.
Findings
The headless compression group (1699 (SD 947) N/mm) had significantly greater proximal-distal stiffness than the unicortical group (668 (SD 298) N/mm), (P = 0.012). Similarly, the headless compression group (604 (SD 148) N/mm) had significantly greater medial-lateral stiffness than the unicortical group (281 (SD 152) N/mm), (P Interpretation
A headless compression screw construct was significantly stiffer in both the proximal-distal and medial-lateral directions, indicating greater resistance to both axial and shear loading. Additionally, they had significantly greater load at clinical failure based on lateral displacement. The low-profile design of the headless compression screw minimizes soft tissue irritation and reduces need for implant removal.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155822
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 1-6[article]Exemplaires (1)
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Titre : Influence of soft tissue in the assessment of the primary fixation of acetabular cup implants using impact analyses Type de document : Article Auteurs : Romain Bosc ; Antoine Tijou ; Giuseppe Rosi Article en page(s) : p. 7-13 Langues : Anglais (eng) Descripteurs : HE Vinci
Prothèse de hancheMots-clés : Biomechanical Phenomena Phénomènes biomécaniques Acetabuloplasty Acétabuloplastie Hip Joint Articulation de la hanche Hip Prosthesis Résumé : Background
The acetabular cup (AC) implant primary stability is an important determinant for the success of cementless hip surgery but it remains difficult to assess the AC implant fixation in the clinic. A method based on the analysis of the impact produced by an instrumented hammer on the ancillary has been developed by our group (Michel et al., 2016a). However, the soft tissue thickness present around the acetabulum may affect the impact response, which may hamper the robustness of the method. The aim of this study is to evaluate the influence of the soft tissue thickness (STT) on the acetabular cup implant primary fixation evaluation using impact analyses.
Methods
To do so, different AC implants were inserted in five bovine bone samples. For each sample, different stability conditions were obtained by changing the cavity diameter. For each configuration, the AC implant was impacted 25 times with 10 and 30 mm of soft tissues positioned underneath the sample. The averaged indicator Im was determined based on the amplitude of the signal for each configuration and each STT and the pull-out force was measured.
Findings
The results show that the resonance frequency of the system increases when the value of the soft tissue thickness decreases. Moreover, an ANOVA analysis shows that there was no significant effect of the value of soft tissue thickness on the values of the indicator Im (F = 2.33; p-value = 0.13).
Interpretation
This study shows that soft tissue thickness does not appear to alter the prediction of the acetabular cup implant primary fixation obtained using the impact analysis approach, opening the path towards future clinical trials.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155823
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 7-13[article]Exemplaires (1)
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Titre : Region-specific foot pain and plantar pressure in people with rheumatoid arthritis : A cross-sectional study Type de document : Article Auteurs : Sarah Stewart ; Matthew B. Carroll ; Angela Brenton-Rule Article en page(s) : p. 14-17 Langues : Anglais (eng) Descripteurs : HE Vinci
Douleur ; Pain ; Pied ; Polyarthrite rhumatoideMots-clés : Arthritis Rheumatoid Foot Foot Ulcer Ulcère du pied Résumé : It is unclear whether region-specific foot pain may influence plantar pressure in people with established rheumatoid arthritis. The aim was to determine the association between region-specific foot pain and region-specific plantar pressure.(...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155824
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 14-17[article]Exemplaires (1)
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Titre : Posterior cervical spine crisscross fixation: Biomechanical evaluation Type de document : Article Auteurs : Joseph F. Cusick ; Frank A. Pintar ; Joseph S. Cheng Article en page(s) : p. 18-22 Langues : Anglais (eng) Descripteurs : HE Vinci
Vertèbres cervicalesMots-clés : Cervical Vertebrae Internal Fixators Fixateurs internes Appareils de fixation orthopédique Orthopedic Fixation Devices Vis orthopédiques Bone Screws Biomechanical Phenomena Phénomènes biomécaniques Résumé : Biomechanical/anatomic limitations may limit the successful implantation, maintenance,and risk acceptance of posterior cervical plate/rod fixation for one stage decompression-fusion. A method of posterior fixation (crisscross) that resolves biomechanical deficiences of previous facet wiring techniques and not reliant upon screw fixation method.
Methods
Thirteen human cadaver spine segments (C2-T1) were tested under flexion-compression loading and four were evaluated additionally under pure-moment load. Preparations were evaluated in a sequence of surgical alterations with intact, laminectomy, lateral mass plate/screw fixation, and crisscross facet fixation using forces, displacements and kinematics.
Findings
Combined loading demonstrated significantly lower bending stiffness (p Interpretation
The crisscross technique of facet fixation offers immediate mechanical stability with resolution of increased flexural rotations induced by multi-level laminectomy. Many of the anatomic limitations and potentially deleterious variables that may be associated with multi-level screw fixation are not associated with facet wire passage, and the subsequent fixation using a pattern of wire connection crossing each facet joint exhibits a comparatively more uniform load distribution. Crisscross wire fixation is a valuable addition to the surgical armamentarium for extensive posterior cervical single-stage decompression-fixation.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155825
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 18-22[article]Exemplaires (1)
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Titre : The influence of the twin peg design on femoral Interface temperature and maximum load to failure in cemented Oxford unicompartmental knee arthroplasty Type de document : Article Auteurs : Tobias Reiner ; Martin Schwarze ; Benjamin Panzram Article en page(s) : p. 23-27 Langues : Anglais (eng) Descripteurs : HE Vinci
Arthroplastie prothétique de genou ; ArthroseMots-clés : Arthroplasty Replacement Knee Implantation de prothèse Prosthesis Implantation Biomechanical Phenomena Phénomènes biomécaniques Osteoarthritis Résumé : Background
The twin peg femoral component was introduced for the cemented Oxford unicondylar knee to increase implant stability. The aim of this experimental study was to investigate the influence of the twin peg design on femoral interface temperature and maximum load to failure in comparison to the single peg design.
Methods
In this experimental study medial Oxford unicompartmental knee arthroplasty was performed in 12 pairs of fresh-frozen human knees. A cemented femoral single peg component was implanted on the one side (group A) and a cemented twin peg component on the other side (group B). Cement interface temperature was continuously monitored during the procedure. Maximum tensile forces of the femoral components were measured by pull-out tests.
Findings
Maximum femoral interface temperatures did not reach critical values for heat necrosis of the bone in group A (mean 28.4, SD 1.2 °C) or group B (mean 27.6, SD 0.5 °C). The maximum load to failure was significantly higher in the twin peg group (mean 3628.41, SD 650.92 N) compared to the single peg group (mean 2979, SD 781 N) (P = 0.016).
Interpretation
Our experiments showed higher load to failure for the twin peg design compared to the single peg design without raising the risk of heat necrosis at the interfacial bone. The twin peg component offers a save alternative to the single peg component in a cadaveric setting.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155826
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 23-27[article]Exemplaires (1)
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Titre : Increased torsional stability by a novel femoral neck locking plate. The role of plate design and pin configuration in a synthetic bone block model Type de document : Article Auteurs : Jan Egil Brattgjerd ; Martin Loferer ; Sanyalak Niratisairak Article en page(s) : p. 28-35 Langues : Anglais (eng) Mots-clés : Femoral Neck Fractures Fractures du col fémoral Internal Fixators Fixateurs internes Biomechanical Phenomena Phénomènes biomécaniques Torsion Mechanical Torsion mécanique Composite bone Résumé : Background
In undisplaced femoral neck fractures, internal fixation remains the main treatment, with mechanical failure as a frequent complication. As torsional stable fixation promotes femoral neck fracture healing, the Hansson Pinloc® System with a plate interlocking pins, was developed from the original hook pins. Since its effect on torsional stability is undocumented, the novel implant was compared with the original configurations.
Methods
Forty-two proximal femur models custom made of two blocks of polyurethane foam were tested. The medial block simulated the cancellous head, while the lateral was laminated with a glass fiber filled epoxy sheet simulating trochanteric cortical bone. Two hollow metal cylinders with a circumferential ball bearing in between mimicked the neck, with a perpendicular fracture in the middle. Fractures were fixated by two or three independent pins or by five configurations involving the interlocking plate (two pins with an optional peg in a small plate, or three pins in a small, medium or large plate). Six torsional tests were performed on each configuration to calculate torsional stiffness, torque at failure and failure energy.
Findings
The novel configurations improved parameters up to an average of 12.0 (stiffness), 19.3 (torque) and 19.9 (energy) times higher than the original two pins (P Interpretation
The novel plate design with its pin configuration enhanced torsional stability. To reveal clinical relevance a clinical study is planned.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155827
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 28-35[article]Exemplaires (1)
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Titre : Slip avoidance strategies in children with bilateral spastic cerebral palsy and crouch gait Type de document : Article Auteurs : Ana Francisca Rozin Kleiner ; Ilaria Pacifici ; Claudia Condoluci Article en page(s) : p. 36-39 Langues : Anglais (eng) Descripteurs : HE Vinci
Enfant (6-12 ans) ; Paralysie cérébraleMots-clés : Cerebral Palsy Child Gait Démarche Résumé : Background
A slip occurs when the required friction (RCOF) to prevent slipping at the foot/floor interfaces exceeds the available friction. The RCOF is dependent upon the biomechanics features of individuals and their gait. On the other hand, the available friction depends on environmental features. Once individuals with crouch gait have their biomechanics of gait completely altered, how do they interact with a supporting surface? The aim was to quantify the RCOF in children with bilateral spastic cerebral palsy (BSCP) and crouch gait.
Methods
11 children with crouch gait and 11 healthy age-matched children were instructed to walk barefoot at self-selected speed over a force platform. The RCOF curve was obtained as the ratio between the tangential forces (FT), and the vertical ground reaction force (FZ). Three points were extracted by the RCOF, FT and FZ curves at the loading response, midstance and push-off phases.
Findings
Children with BSCP presented higher values of RCOF in all support phase and lower gait velocity relative to the healthy controls. For BSCP group no correlation between FT and FZ were found, indicating that this group is not able to negotiate the forces during the support phase.
Interpretation
Children with BSCP and crouch gait are not able to negotiate the forces applied on the ground in support phase, so to avoid the fall, their strategy is to reduce the gait velocity.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155828
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Titre : Effects of localized vibration on knee joint position sense in individuals with anterior cruciate ligament reconstruction Type de document : Article Auteurs : Takashi Nagai ; Nathaniel A. Bates ; Timothy E. Hewett Article en page(s) : p. 40-44 Langues : Anglais (eng) Descripteurs : HE Vinci
Proprioception ; VibrationMots-clés : Anterior Cruciate Ligament Ligament croisé antérieur Anterior Cruciate Ligament Reconstruction Reconstruction du ligament croisé antérieur Muscle Spindles Fuseaux neuromusculaires Résumé : Background
Anterior cruciate ligament injury can disrupt one's mechanoreceptors and result in decreased proprioception such as joint position sense and ultimately altered motor function. The application of localized vibration has been used to investigate the integrity of the sensorimotor system and the mechanisms of quadriceps function after anterior cruciate ligament injury and reconstruction. The purpose of the study is to evaluate joint position sense with and without vibration and compare among anterior cruciate ligament reconstructed, contralateral, and control limbs.
Methods
Fourteen subjects with anterior cruciate ligament reconstruction (8 males and 6 females) and fourteen control subjects (7 males and 7 females) participated in the study. Subjects sat on an isokinetic dynamometer chair with localized vibration strapped on the quadriceps tendon while visual and auditory cues were removed. Subjects were asked to remember an active target position and replicate that position actively. The absolute difference between the target and replicated trial was used as joint position sense. There were three trials at three target positions (15, 45, and 75 degrees of knee flexion) with and without vibration. The order of testing conditions was randomized. One-way analysis of variance or non-parametric equivalent (Kruskal-Wallis test) was used to compare among limbs. Significance was set at P Findings
There were no significant joint position sense differences among anterior cruciate ligament reconstructed, contralateral, and control limbs with or without vibration (P = 0.207–0.914).
Interpretation
There are several potential reasons for the current findings: vibration-induced post effect, locations of vibration, types of vibration, and rehabilitation status. Future studies should expand the current investigation and explore both sensory and motor functions in anterior cruciate ligament reconstructed subjects.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155829
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 40-44[article]Exemplaires (1)
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Titre : Bipedal hopping timed to a metronome to detect impairments in anticipatory motor control in people with mild multiple sclerosis Type de document : Article Auteurs : Megan C. Kirkland ; Alice Chen ; Matthew B. Downer Article en page(s) : p. 45-52 Langues : Anglais (eng) Descripteurs : HE Vinci
Cognition ; Sclérose en plaquesMots-clés : Multiple Sclerosis Postural Balance Équilibre postural Motor Disorders Troubles moteurs Résumé : Background
People with mild multiple sclerosis (MS) often report subtle deficits in balance and cognition but display no measurable impairment on clinical assessments. We examined whether hopping to a metronome beat had the potential to detect anticipatory motor control deficits among people with mild MS (Expanded Disability Status Scale ≤ 3.5).
Methods
Participants with MS (n = 13), matched controls (n = 9), and elderly subjects (n = 13) completed tests of cognition (Montreal Cognitive Assessment (MoCA)) and motor performance (Timed 25 Foot Walk Test (T25FWT)). Participants performed two bipedal hopping tasks: at 40 beats/min (bpm) and 60-bpm in random order. Hop characteristics (length, symmetry, variability) and delay from the metronome beat were extracted from an instrumented walkway and compared between groups.
Results
The MS group became more delayed from the metronome beat over time whereas elderly subjects tended to hop closer to the beat (F = 4.52, p = 0.02). Delay of the first hop during 60-bpm predicted cognition in people with MS (R = 0.55, β = 4.64 (SD 4.63), F = 4.85, p = 0.05) but not among control (R = 0.07, p = 0.86) or elderly subjects (R = 0.17, p = 0.57). In terms of hopping characteristics, at 60-bpm, people with MS and matched controls were significantly different from the elderly group. However, at 40-bpm, the MS group was no longer significantly different from the elderly group, even though matched controls and elderly still differed significantly.
Conclusions
This new timed hopping test may be able to detect both physical ability, and feed-forward anticipatory control impairments in people with mild MS. Hopping at a frequency of 40-bpm seemed more challenging. Several aspects of anticipatory motor control can be measured: including reaction time to the first metronome cue and the ability to adapt and anticipate the beat over time.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155830
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 45-52[article]Exemplaires (1)
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Titre : Is there evidence to use kinematic/kinetic measures clinically in low back pain patients ? A systematic review Type de document : Article Auteurs : Enrica Papi ; Anthony M.J. Bull ; Alison H. McGregor Article en page(s) : p. 53-64 Langues : Anglais (eng) Descripteurs : HE Vinci
Évaluation de résultat (soins) ; Lombalgie ; Mouvement du corpsMots-clés : Low Back Pain Movement Outcome Assessment (Health Care) Résumé : Currently, there is a widespread reliance on self-reported questionnaires to assess low back pain patients. However, it has been suggested that objective measures of low back pain patients' functional status should be used to aid clinical assessment. The aim of this study is to systematically review which kinematic/kinetic parameters have been used to assess low back pain patients against healthy controls and to propose clinical kinematic/kinetic measures. Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155831
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 53-64[article]Exemplaires (1)
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Titre : Transfemoral amputee intact limb loading and compensatory gait mechanics during down slope ambulation and the effect of prosthetic knee mechanisms Type de document : Article Auteurs : David C. Morgenroth ; Michelle Roland ; Alison L. Pruziner Article en page(s) : p. 65-72 Langues : Anglais (eng) Descripteurs : HE Vinci
Amputés ; Mécanique ; Membre inférieur ; Prothèse de genouMots-clés : Amputees Artificial Limbs Membres artificiels Lower Extremity Dependent Ambulation Déambulation dépendante Mechanics Knee Prosthesis Résumé : Background
Intact limb knee osteoarthritis is a prevalent secondary disability in transfemoral amputees. Walking down a ramp may increase this risk due to excessive limb loading. We sought to determine whether intact limb loading differed between transfemoral amputees and controls during down slope ambulation, and the compensatory strategies transfemoral amputees used to modify intact limb loading. Secondarily, we sought to determine the effect of prosthetic knee type.
Methods
Five unilateral transfemoral amputees and five non-amputee controls walked down a ramp and the following outcome measures were compared between amputees and controls and across prosthetic knee type (C-leg versus Power Knee): step length, walking speed, leading limb ground reaction forces, and trailing and leading limb ankle and knee energy absorption. Linear mixed effects regression was used to test for association between gait variables and limb.
Findings
There were no significant differences in intact limb loading between amputees and controls or between prosthetic knee types. Transfemoral amputees walked slower (C-leg - control = −0.29 m/s; P = 0.008, Power Knee – control = −0.38 m/s; P Interpretation
Intact limb loading in transfemoral amputees is equivalent to controls during down ramp ambulation, in spite of reduced prosthetic trailing limb energy absorption. The primary compensatory strategies include a reduced ambulation speed and intact limb step length, which reduces center of mass velocity at heel contact.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155832
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 65-72[article]Exemplaires (1)
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Titre : The trabecular effect: A population-based longitudinal study on age and sex differences in bone mineral density and vertebral load bearing capacity Type de document : Article Auteurs : Marianna L. Oppenheimer-Velez ; Hugo Giambini ; Asghar Rezaei Article en page(s) : p. 73-78 Langues : Anglais (eng) Descripteurs : HE Vinci
Age de la vie ; Densite osseuse ; Fracture ; Ostéoporose ; Risque ; Sexe ; TomographieMots-clés : Osteoporosis Tomography Cancellous Bone Os spongieux Risk Bone Density Sex Weight-Bearing Mise en charge Résumé : Background
Approximately 16–24% of postmenopausal women are affected by vertebral fractures, negatively affecting their quality of life. Trabecular and cortical bones in vertebrae decline differently with age, thus having a distinct impact on vertebral failure loads. The purpose of this study was to investigate the effect of trabecular and cortical volumetric bone mineral density loss over time on estimated failure loads; and to evaluate the effect of sex and age.
Method
Fracture properties from a cohort of 82 patients were evaluated for L1–L3 vertebrae at baseline and 6th year using an image-based method that implements axial rigidity analysis. Cortical and trabecular volumetric bone mineral density were obtained, as well as their individual contribution to total failure load. Regression analyses were performed to determine the effect of age and sex on volumetric bone mineral density and failure loads.
Findings
Decline in trabecular and cortical volumetric bone mineral density, and failure load was sex-dependent (p ≤ 0.0095). Cortical and trabecular volumetric bone mineral density reduced 2.08 (g/cm3)/year and 2.02 (g/cm3)/year, respectively. A 1012 N difference in failure load, ~70% attributed to trabecular bone, was found between men and women of similar age. Over 6 years, this difference increased by 287 N. Areal bone mineral density measured by dual X-ray absorptiometry explained ~60% of the vertebral failure load.
Interpretation
Trabecular bone has a significantly greater effect than cortical bone on the structural integrity and load bearing capacity of vertebrae. This might lead to a higher incidence of fragility fractures in osteoporotic women. Our non-invasive, quantitative computed tomography image-based approach may improve prevention, monitoring, and management of fractures.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155833
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 73-78[article]Exemplaires (1)
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Titre : Upper-limb biomechanical analysis of wheelchair transfer techniques in two toilet configurations Type de document : Article Auteurs : Chung-Ying Tsai ; Michael L. Boninger ; Sarah R. Bass Article en page(s) : p. 79-85 Langues : Anglais (eng) Descripteurs : HE Vinci
Activités de la vie quotidienne ; Environnement ; Guide de bonnes pratiques ; Membre supérieur ; Rééducation et réadaptation ; Traumatismes de la moelle épinièreMots-clés : Upper Extremity Biomechanical Phenomena Phénomènes biomécaniques Spinal Cord Injuries Training Support Soutien financier à la formation Activities of Daily Living Environment Practice Guideline Résumé : Background
Using proper technique is important for minimizing upper limb kinetics during wheelchair transfers. The objective of the study was to 1) evaluate the transfer techniques used during toilet transfers and 2) determine the impact of technique on upper limb joint loading for two different toilet configurations.
Methods
Twenty-six manual wheelchair users (23 men and 3 women) performed transfers in a side and front wheelchair-toilet orientation while their habitual transfer techniques were evaluated using the Transfer Assessment Instrument. A motion analysis system and force sensors were used to record biomechanical data during the transfers.
Findings
More than 20% of the participants failed to complete five transfer skills in the side setup compared to three skills in the front setup. Higher quality skills overall were associated with lower peak forces and moments in both toilet configurations (−0.68 Interpretation
Transfer skills training, making toilet seats level with the wheelchair seat, positioning the wheelchair closer to the toilet and mounting grab bars in a more ideal location for persons who do sitting pivot transfers may facilitate better quality toilet transfers.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155834
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 79-85[article]Exemplaires (1)
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Titre : Examining upper limb kinematics and dysfunction of breast cancer survivors in functional dynamic tasks Type de document : Article Auteurs : Rebecca L. Brookham ; Alan C. Cudlip ; Clark R. Dickerson Article en page(s) : p. 86-93 Langues : Anglais (eng) Descripteurs : HE Vinci
Membre supérieur ; Tumeurs du seinMots-clés : Breast Neoplasms Breast Cancer Lymphedema Lymphoedème après cancer du sein Upper Extremity Biomechanical Phenomena Phénomènes biomécaniques Résumé : Background
Comorbidities within the breast cancer population can reduce quality of life. Current breast cancer survivor upper limb kinematic strategies unfortunately lack robust connection with performing important activities of daily living.
Methods
Accordingly, fifty breast cancer survivors performed 88 dynamic tasks (divided into range of motion-reach, range of motion-rotate, activity of daily living, and work tasks). Humerothoracic and scapulothoracic angles were extracted from motion capture data. Bilateral differences existed for range of motion, and maximal and minimal scapulothoracic and humerothoracic angles.
Findings
Generally, the affected side used less range of motion across task types. Humerothoracic angles on the affected side experienced 6.7° less range of motion in plane of elevation in range of motion-reach (p Interpretation
A reduced range of motion on the affected side suggests the breast cancer population had less varied movement strategies, keeping movements in narrower ranges to avoid disability, pain, or subacromial impingement. This investigation produced an unprecedentedly diverse collection of three-dimensional humerothoracic and scapulothoracic kinematics for a breast cancer population. Documentation of physical capability, dysfunction, and adaptive strategies is a crucial step towards developing targeted strategies for enhancing functional recovery in breast cancer survivors.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155835
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 86-93[article]Exemplaires (1)
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Titre : Bioabsorbable plating in the treatment of pediatric clavicle fractures: A biomechanical and clinical analysis Type de document : Article Auteurs : Emily J. Osborn ; Christine L. Farnsworth ; Joshua D. Doan Article en page(s) : p. 94-99 Langues : Anglais (eng) Descripteurs : HE Vinci
Adolescent ; Clavicule ; Fracture ; Implant résorbableMots-clés : Absorbable Implants Clavicle Résumé : Background
Classic implants for operative intervention of mid-shaft clavicle fractures in adolescents can become symptomatic, requiring removal. This study compares 1) biomechanical properties and 2) clinical outcomes in adolescents of mid-shaft clavicle fracture fixation with bioabsorbable versus metal implants.
Methods
Six synthetic clavicles with mid-shaft fractures underwent bioabsorbable plating. A testing frame applied 10 non-destructive torsion and 10 axial compression cycles, followed by cantilever bending to failure. Stiffness was calculated; maximum failure load and failure mode were recorded. Results were compared to previous data for locked metal constructs.
Retrospective review of surgically treated clavicle fractures over three years included functional and radiographic outcomes.
Findings
Bioabsorbable plates had lower torsional stiffness (P
Seven patients with bioabsorbable implants were included. All patients with bioabsorbable constructs achieved radiographic union, but 71% lost reduction. Despite fracture angulation, all achieved normal shoulder function after one year determined by QuickDASH evaluation. None required a second surgery.
Interpretation
Bioabsorbable implants had lower torsional stiffness and cantilever failure load, but comparable compression stiffness to metal implants. Bioabsorbable implants failed via gradual bending versus the catastrophic failure seen in metal implants. The clinical review allows understanding of the sequelae of this lower failure load of bioabsorbable plates where their use allowed in fracture displacement, yet achievement of ultimate radiographic union and acceptable functional outcomes.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155836
in Clinical Biomechanics > Vol. 55 (June 2018) . - p. 94-99[article]Exemplaires (1)
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Titre : Scapular kinematics in professional wheelchair tennis players Type de document : Article Auteurs : Martin B. Warner ; David Wilson ; Markus O. Heller ; [et al.] Article en page(s) : p. 7-13 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.01.022 Langues : Anglais (eng) Descripteurs : HE Vinci
Personnes handicapéesMots-clés : Cinématique scapulaire Tennis Athlète Fauteuils roulants Résumé : Background
Participating in wheelchair tennis increases the demands placed on the shoulder and could increase the risk of developing shoulder pain and injury that might be associated with differences in scapular kinematics. The aim of the study was to examine the presence of shoulder pain and scapular kinematics in professional wheelchair tennis players.
Method
Scapular kinematics were obtained in 11 professional wheelchair tennis players, 16 people with shoulder impingement and 16 people without shoulder impingement during humeral elevation and lowering. Clinical examination of the wheelchair tennis players was undertaken using the Wheelchair Users Shoulder Disability Index (WUSPI) and clinical signs of shoulder impingement.
Findings
The WUSPI questionnaire (mean = 28 SD 13.8) demonstrated wheelchair tennis participants experienced little shoulder pain and clinical examination revealed negative impingement tests. Wheelchair tennis players had greater scapular posterior tilt during humeral elevation (3.9° SE 1.71; P = 0.048) and lowering (4.3° SE 1.8; P = 0.04) on the dominant compared to non-dominant side. The dominant scapulae of wheelchair tennis players were significantly (P = 0.014) more upwardly rotated (21° SD 6.7) than the scapulae of people with shoulder impingement (14.1° SD 7.0) during scapular plane humeral elevation.
Interpretation
This first study of scapular kinematics in professional wheelchair tennis athletes demonstrated bilateral asymmetries and differences to able-bodied participants with shoulder impingement. Understanding the role of sport participation on shoulder function in wheelchair users would assist in the development of preventative and treatment exercise programmes for wheelchair users at risk of shoulder injury and pain.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155806
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 7-13[article]Exemplaires (1)
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Titre : Superior cortical screw in osteoporotic lumbar vertebrae : A biomechanics and microstructure-based study Type de document : Article Auteurs : Tianming Yu ; Xuyang Zhang ; Junhui Liu ; [et al.] Article en page(s) : p. 14-21 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.01.017 Langues : Anglais (eng) Descripteurs : HE Vinci
OstéoporoseMots-clés : Vertèbres lombaires ostéoporiques Vis corticale Étude biomécanique Micro-CT Résumé : Background
Osteoporosis reduces the bone-screw purchase, potentially reducing pullout strength and other biomechanical properties. However, the existing pedicle screw approach may not compensate for the detrimental effects of decreased vertebral bone mineral density.
Methods
Two methods of screw insertion were performed in thirteen cadaveric osteoporotic lumbar vertebrae: Magerl's method in the left pedicle, and superior cortical screw method in the right (its entry point located vertically 3 mm above Magerl's point). Before screw fixations, the pedicle and its corresponding vertebral body were divided into six equal layers from cranial to caudal by performing micro-CT and tested for microstructure properties, such as bone mineral density, trabecular bone volume fraction, trabecular thickness, trabecular separation and trabecular number. Further, pedicle was horizontally divided into three regions and tested. After screw fixations, microstructure properties of the bone surrounding the screws were analyzed. Finally, the screw pullout strength was tested biomechanically.
Findings
The bone structure is denser in the upper third of the pedicle and its corresponding vertebral body. A similar microstructure is seen within the pedicle. This study reveals that the pullout strength is significantly correlated to the bone mineral density, trabecular bone volume fraction and trabecular thickness. Biomechanical test showed pullout strength in the superior cortical screw group with mean 613.3 N (SD 200.4) was 22.4% higher than that in the Magerl group with mean 501.2 N (SD 256.6).
Interpretation
The superior cortical screw method can be a reliable alternative, to provide better pullout strength for posterior lumbar instrumentation, especially in osteoporotic patients.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155807
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 14-21[article]Exemplaires (1)
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Titre : The relationship between balance performance, lumbar extension strength, trunk extension endurance, and pain in participants with chronic low back pain, and those without Type de document : Article Auteurs : Jessica Behennah ; Rebecca Conway ; James Fisher ; [et al.] Article en page(s) : p. 22-30 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.01.023 Langues : Anglais (eng) Descripteurs : HE Vinci
Équilibre postural ; Force ; Lombalgie ; Maladie chronique ; PerformanceMots-clés : Extension lombaire Extension du tronc Résumé : Background
Chronic low back pain is associated with lumbar extensor deconditioning. This may contribute to decreased neuromuscular control and balance. However, balance is also influenced by the hip musculature. Thus, the purpose of this study was to examine balance in both asymptomatic participants and those with chronic low back pain, and to examine the relationships among balance, lumbar extension strength, trunk extension endurance, and pain.
Methods
Forty three asymptomatic participants and 21 participants with non-specific chronic low back pain underwent balance testing using the Star Excursion Balance Test, lumbar extension strength, trunk extension endurance, and pain using a visual analogue scale.
Findings
Significant correlations were found between lumbar extension strength and Star Excursion Balance Test scores in the chronic low back pain group (r = 0.439–0.615) and in the asymptomatic group (r = 0.309–0.411). Correlations in the chronic low back pain group were consistently found in posterior directions. Lumbar extension strength explained ~19.3% to ~37.8% of the variance in Star Excursion Balance Test scores for the chronic low back pain group and ~9.5% to ~16.9% for the asymptomatic group.
Interpretation
These results suggest that the lumbar extensors may be an important factor in determining the motor control dysfunctions, such as limited balance, that arise in chronic low back pain. As such, specific strengthening of this musculature may be an approach to aid in reversing these dysfunctions.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155808
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 22-30[article]Exemplaires (1)
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Titre : Changes in patellofemoral pain resulting from repetitive impact landings are associated with the magnitude and rate of patellofemoral joint loading Type de document : Article Auteurs : Lee T. Atkins ; Roger C. James ; Hyung Suk Yang ; [et al.] Article en page(s) : p. 31-36 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.006 Langues : Anglais (eng) Descripteurs : HE Vinci
CinématiqueMots-clés : Douleur fémoropatellaire Atterrissage Chargement des articulations Résumé : Background
Although a relationship between elevated patellofemoral forces and pain has been proposed, it is unknown which joint loading variable (magnitude, rate) is best associated with pain changes. The purpose of this study was to examine associations among patellofemoral joint loading variables and changes in patellofemoral pain across repeated single limb landings.
Methods
Thirty-one females (age: 23.5(2.8) year; height: 166.8(5.8) cm; mass: 59.6(8.1) kg) with PFP performed 5 landing trials from 0.25 m. The dependent variable was rate of change in pain obtained from self-reported pain scores following each trial. Independent variables included 5-trial averages of peak, time-integral, and average and maximum development rates of the patellofemoral joint reaction force obtained using a previously described model. Pearson correlation coefficients were calculated to evaluate individual associations between rate of change in pain and each independent variable (α = 0.05). Stepwise linear multiple regression (αenter = 0.05; αexit = 0.10) was used to identify the best predictor of rate of change in pain.
Findings
Subjects reported an average increase of 0.38 pain points with each landing trial. Although, rate of change in pain was positively correlated with peak force (r = 0.44, p = 0.01), and average (r = 0.41, p = 0.02) and maximum force development rates (r = 0.39, p = 0.03), only the peak force entered the predictive model explaining 19% of variance in rate of change in pain (r2 = 0.19, p = 0.01).
Interpretation
Peak patellofemoral joint reaction force was the best predictor of the rate of change in pain following repetitive singe limb landings. The current study supports the theory that patellofemoral joint loading contributes to changes in patellofemoral pain.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155809
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 31-36[article]Exemplaires (1)
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Titre : Increased movement variability in one-leg hops about 20 years after treatment of anterior cruciate ligament injury Type de document : Article Auteurs : Divya Srinivasan ; Eva Tengman ; Charlotte K. Häger Article en page(s) : p. 37-45 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.003 Langues : Anglais (eng) Descripteurs : HE Vinci
Cinématique ; Plaies et blessures ; Rééducation et réadaptation ; Saut ; Techniques de physiothérapieMots-clés : Ligament croisé antérieur Variabilité du mouvement Résumé : Background
Recent studies highlight the need for understanding movement control of adjacent joints when evaluating knee function following anterior cruciate ligament (ACL) injury. However, while short-term adaptations to lower-extremity joint coupling have been studied, little is known about any potential long-term adaptations in neuromuscular control displayed by ACL-injured individuals. The aim of our study was to determine whether coordination variability of the hip-knee joint couplings during the one-leg hop is altered about 20 years after injury in two ACL-injured groups compared to healthy knee controls.
Methods
Seventy persons performed one leg hops ~23 years after ACL injury and following different treatments: 33 participants treated with physiotherapy in combination with ACL-reconstruction (ACLR); 37 participants with physiotherapy alone (ACLPT). They were compared to 33 matched controls. A vector coding procedure was used to create joint couplings for knee and hip angles on all the cardinal planes for the Take-off and Landing phases. The standard deviation of each coupling was computed as a measure of coordination variability.
Findings
Both the ACL groups differed significantly from controls on their injured side with ~50% higher knee abduction-adduction/hip internal-external rotation variability during the Take-off phase; ~33% higher knee abduction-adduction/knee flexion-extension variability and greater knee abduction-adduction/hip flexion-extension variability (ACLR 50%; ACLPT 80%) during the Landing phase. There were no major differences between injured and non-injured sides in any group.
Interpretation
Increased variability in lower-extremity joint couplings has emerged as a conspicuous feature of ACL injured persons in the very long term compared to non-injured controls, independent of treatment. Further research of the processes leading to alterations in movement variability using longitudinal studies would facilitate better understanding of the functional adaptations leading to knee dysfunction in the short- and long-term after ACL injury.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155810
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 37-45[article]Exemplaires (1)
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Titre : Can breast characteristics predict upper torso musculoskeletal pain? Type de document : Article Auteurs : Celeste E. Coltman ; Julie R. Steele ; Deirdre E. McGhee Article en page(s) : p. 46-53 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.002 Langues : Anglais (eng) Descripteurs : HE Vinci
SeinMots-clés : Douleur musculosquelettique Torse Distance entre les mamelons Volume de poitrine Résumé : Background
Several studies have associated a large breast size with an increased prevalence and severity of musculoskeletal pain, particularly pain in the upper torso. Despite this evidence, no research has explored whether breast size or related characteristics are risk factors for upper torso musculoskeletal pain.
Methods
A backward multiple regression analysis was performed to identify whether characteristics of the breasts and upper torso, as well as physical factors known to be associated with musculoskeletal pain, could predict musculoskeletal pain among a cohort of 378 Australian women aged 18 years and over who had a wide range of breast sizes.
Findings
The model identified that breast volume, age and nipple-to-nipple distance predicted 23% of the variance in upper torso musculoskeletal pain reported by the participants.
Interpretation
Women with a larger breast volume, lower age and a greater nipple-to-nipple distance were predicted to report a higher upper torso musculoskeletal pain score.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155811
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 46-53[article]Exemplaires (1)
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Titre : Medial tilting of the joint line in posterior stabilized total knee arthroplasty increases contact force and stress Type de document : Article Auteurs : Yoshihisa Tanaka ; Shinichiro Nakamura ; Shinichi Kuriyama ; [et al.] Article en page(s) : p. 54-59 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.008 Langues : Anglais (eng) Descripteurs : HE Vinci
StressMots-clés : Arthroplastie totale du genou Prothèse et implant Force de contact Inclinaison médiale de la ligne de jointure Résumé : Background
Kinematically aligned total knee arthroplasty is based on the concept to represent the premorbid joint alignment with cruciate-retaining implants, characterized by medial tilt and internal rotation. However, kinematic and kinetic effects of kinematically aligned total knee arthroplasty with posterior-stabilized implants is unknown. The purpose of this study was to examine the effect of medial tilting of the joint line with posterior-stabilized implants.
Methods
A mechanical alignment model, and medial tilt 3° and 5° models were constructed. Knee kinematics and contact forces were simulated using a musculoskeletal computer simulation model. Contact stresses on the tibiofemoral joint and the post area were then calculated using finite element analysis.
Findings
From 0° to 120° of knee flexion, greater external rotation of the femoral component was observed in medial tilt models (−0.6°, 1.8° and 4.2° in mechanical alignment, medial tilt 3° and medial tilt 5° models, respectively). The peak contact stresses on the tibiofemoral joint and the post area at 120° of knee flexion were higher in medial tilt models. The peak contact stresses on the post area in medial tilt 3° and 5° models were 2.2 and 3.8 times greater than that in mechanical alignment model, respectively.
Interpretation
Medial tilting of the joint line causes greater axial rotation even with posterior-stabilized implants, which can represent near-normal kinematics. However, medial tilting of the joint line in total knee arthroplasty with posterior-stabilized implants may have a higher risk for polyethylene wear at the tibiofemoral joint and post area, leading to subsequent component loosening.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155812
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 54-59[article]Exemplaires (1)
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Titre : Large enthesophytes in teenage skulls: Mechanical, inflammatory and genetic considerations Type de document : Article Auteurs : David Shahar ; John Evans ; Mark G.L. Sayers Article en page(s) : p. 60-64 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.004 Langues : Anglais (eng) Descripteurs : HE Vinci
Adolescent ; Crâne ; Génétique ; Inflammation ; Pelvispondylite rhumatismaleMots-clés : Ostéophyte Spondylarthrite Charge biomécanique Résumé : Background
The literature implies that large enthesophytes are exclusive to genetically predisposed individuals and to Spondyloarthropathies sufferers. Accordingly, the aim of this investigation and report was to assess the involvement of genetic predisposition, inflammatory and/or mechanical influences in the development of large enthesophytes in a sample population of teenagers presenting with large enthesophytes emanating from the external occipital protuberance.
Methods
Analysis was based on four teenage males (13–16 year-old) possessing 14.5–30.5 mm enthesophytes projecting from the external occipital protuberance. This study included assessment of radiographs, MRI scans, blood-work, history, the SF-36 health survey, and the comparison of these data with the relevant literature to describe the interrelationships between the presence of enlarged external occipital protuberance, forward head protraction, active inflammation and/or genetic factors.
Findings
Known genetic markers (e.g. HLA-B27) were not detected by allele-specific primers and both ESR and CRP tests were negative. Additionally, MRI analyses failed to detect active localised inflammation at the external occipital protuberance and surrounding structures. The health survey yielded normal parameters for all participants. All participants displayed significantly large Forward Head Protraction values (>40 mm), and interviews with participants and their parents indicated that concerns related to posture were prevalent since early childhood.
Interpretation
This report suggests that mechanical load has an important role in enthesophyte development, irrespective the involvement of inflammatory or genetic factors.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155813
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 60-64[article]Exemplaires (1)
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Titre : Assessment of cervical stiffness in axial rotation among chronic neck pain patients : A trial in the framework of a non-manipulative osteopathic management Type de document : Article Auteurs : P.-M. Dugailly ; A. Coucke ; W. Salem ; V. Feipel Article en page(s) : p. 65-71 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.005 Langues : Anglais (eng) Descripteurs : HE Vinci
Cervicalgie ; Maladie chroniqueMots-clés : Valuation Raideur des cervicales Rotation axiale Traitement homéopathique Résumé : Background
Cervical stiffness is a clinical feature commonly appraised during the functional examination of cervical spine. Measurements of cervical stiffness in axial rotation have not been reported for patients with neck pain. The purpose of this study was to investigate cervical spine stiffness in axial rotation among neck pain patients and asymptomatic subjects, and to analyze the impact of osteopathic management.
Methods
Thirty-five individuals (17 patients) were enrolled. Measurements were carried out for left-right axial rotation using a torque meter device, prior and after intervention. Passive range of motion, stiffness, and elastic-and neutral zone magnitudes were analyzed. Pain intensity was also collected for patients. The intervention consisted in one single session of non-manipulative osteopathic treatment performed in both groups.
Findings
A significant main effect of intervention was found for total range of motion and neutral zone. Also, treatment by group interaction was demonstrated for neutral-, elastic zone, stiffness in right axial rotation, and for total neutral zone. Significant changes were observed in the clinical group after intervention, indicating elastic zone decrease and neutral zone increase. In contrast, no significant alteration was detected for the control group.
Interpretations
Stiffness characteristics of the cervical spine in axial rotation are prone to be altered in patients with neck pain, but seem to be relieved after a session of non-manipulative manual therapeutic techniques. Further investigations, including randomized clinical trials with various clinical populations and therapeutic modalities, are needed to confirm these preliminary findings.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155814
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 65-71[article]Exemplaires (1)
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Titre : Does pedicle screw fixation of the subaxial cervical spine provide adequate stabilization in a multilevel vertebral body fracture model? : An in vitro biomechanical study Type de document : Article Auteurs : John Duff ; Mir M. Hussain ; Noelle Klocke ; [et al.] Article en page(s) : p. 72-78 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.009 Langues : Anglais (eng) Descripteurs : HE Vinci
BiomécaniqueMots-clés : Fixation par vis pédiculaire Colonne cervicale Corps vertébral Support de la colonne antérieure modèle de fracture du corps Résumé : Background
Cervical vertebral body fractures generally are treated through an anterior-posterior approach. Cervical pedicle screws offer an alternative to circumferential fixation. This biomechanical study quantifies whether cervical pedicle screws alone can restore the stability of a three-column vertebral body fracture, making standard 360° reconstruction unnecessary.
Methods
Range of motion (2.0 Nm) in flexion-extension, lateral bending, and axial rotation was tested on 10 cadaveric specimens (five/group) at C2–T1 with a spine kinematics simulator. Specimens were tested for flexibility of intact when a fatigue protocol with instrumentation was used to evaluate construct longevity. For a C4–6 fracture, spines were instrumented with 360° reconstruction (corpectomy spacer + plate + lateral mass screws) (Group 1) or cervical pedicle screw reconstruction (C3 and C7 only) (Group 2).
Findings
Results are expressed as percentage of intact (100%). In Group 1, 360° reconstruction resulted in decreased motion during flexion-extension, lateral bending, and axial rotation, to 21.5%, 14.1%, and 48.6%, respectively, following 18,000 cycles of flexion-extension testing. In Group 2, cervical pedicle screw reconstruction led to reduced motion after cyclic flexion-extension testing, to 38.4%, 12.3%, and 51.1% during flexion-extension, lateral bending, and axial rotation, respectively.
Interpretation
The 360° stabilization procedure provided the greatest initial stability. Cervical pedicle screw reconstruction resulted in less change in motion following cyclic loading with less variation from specimen to specimen, possibly caused by loosening of the shorter lateral mass screws. Cervical pedicle screw stabilization may be a viable alternative to 360° reconstruction for restoring multilevel vertebral body fracture.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155815
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 72-78[article]Exemplaires (1)
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Titre : Peak knee biomechanics and limb symmetry following unilateral anterior cruciate ligament reconstruction : Associations of walking gait and jump-landing outcomes Type de document : Article Auteurs : Steven J. Pfeiffer ; Troy J. Blackburn ; Brittney Luc-Harkey ; [et al.] Article en page(s) : p. 79-85 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.01.020 Langues : Anglais (eng) Résumé : Background
Aberrant walking-gait and jump-landing biomechanics may influence the development of post-traumatic osteoarthritis and increase the risk of a second anterior cruciate ligament injury, respectively. It remains unknown if individuals who demonstrate altered walking-gait biomechanics demonstrate similar altered biomechanics during jump-landing. Our aim was to determine associations in peak knee biomechanics and limb-symmetry indices between walking-gait and jump-landing tasks in individuals with a unilateral anterior cruciate ligament reconstruction.
Methods
Thirty-five individuals (74% women, 22.1 [3.4] years old, 25 [3.89] kg/m2) with an anterior cruciate ligament reconstruction performed 5-trials of self-selected walking-gait and jump-landing. Peak kinetics and kinematics were extracted from the first 50% of stance phase during walking-gait and first 100 ms following ground contact for jump-landing. Pearson product-moment (r) and Spearman's Rho (ρ) analyses were used to evaluate relationships between outcome measures. Significance was set a priori (P ≤ 0.05).
Findings
All associations between walking-gait and jump-landing for the involved limb, along with the majority of associations for limb-symmetry indices and the uninvolved limb, were negligible and non-statistically significant. There were weak significant associations for instantaneous loading rate (ρ = 0.39, P = 0.02) and peak knee abduction angle (ρ = 0.36, p = 0.03) uninvolved limb, as well as peak abduction displacement limb-symmetry indices (ρ= − 0.39, p = 0.02) between walking-gait and jump-landing.
Interpretation
No systematic associations were found between walking-gait and jump-landing biomechanics for either limb or limb-symmetry indices in people with unilateral anterior cruciate ligament reconstruction. Individuals with an anterior cruciate ligament reconstruction who demonstrate high-involved limb loading or asymmetries during jump-landing may not demonstrate similar biomechanics during walking-gait.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155816
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 79-85[article]Exemplaires (1)
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Titre : An exploratory study on differences in cumulative plantar tissue stress between healing and non-healing plantar neuropathic diabetic foot ulcers Type de document : Article Auteurs : Jaap J. van Netten ; Jeff G. van Baal ; Adriaan Bril ; [et al.] Article en page(s) : p. 86-92 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.012 Langues : Anglais (eng) Descripteurs : HE Vinci
Pied diabetique ; UlcereMots-clés : Neuropathie plantaire Étude exploratoire Stress tissulaire Accumulation du stress: Résumé : Background
Mechanical stress is important in causing and healing plantar diabetic foot ulcers, but almost always studied as peak pressure only. Measuring cumulative plantar tissue stress combines plantar pressure and ambulatory activity, and better defines the load on ulcers. Our aim was to explore differences in cumulative plantar tissue stress between people with healing and non-healing plantar diabetic foot ulcers.
Methods
We analyzed a subgroup of 31 patients from a randomized clinical trial, treated with a removable offloading device for their plantar diabetic forefoot ulcer. We measured in-device dynamic plantar pressure and daily stride count to calculate cumulative plantar tissue stress at the ulcer location and associated this with ulcer healing and ulcer surface area reduction at four weeks (Student's t and chi-square test for significance, Cohen's d for effect size).
Findings
In 12 weeks, 68% (n = 21) of the ulcers healed and 32% (n = 10) did not. No statistically significant differences were found for cumulative plantar tissue stress, plantar pressure or ambulatory activity between people with healed and not-healed ulcers. Cumulative plantar tissue stress was 25% lower for people with healed ulcers (155 vs. 207 MPa·s/day; P = 0.71; Effect size: d = 0.29). Post-hoc analyses in the 27 patients who self-reported to be adherent to wearing the device showed that cumulative plantar tissue stress was 49% lower for those who reached ≥75% ulcer surface area reduction at four weeks (140 vs. 275 MPa·s/day; P = 0.09; d = 0.76); smaller differences and effect sizes were found for peak pressure (24%), peak pressure-time integral (30%) and ambulatory activity (26%); (P-value range: 0.14–0.97; Cohen's d range: 0.14–0.70).
Interpretation
Measuring cumulative plantar tissue stress may provide insight beyond that obtained from plantar pressure or ambulatory activity alone, with regard to diabetic foot ulcer healing using removable offloading devices. These explorative findings provide baseline data for further studies on this relevant topic.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155817
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 86-92[article]Exemplaires (1)
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Titre : The impact of hip implant alignment on muscle and joint loading during dynamic activities Type de document : Article Auteurs : Casey A. Myers ; Peter J. Laz ; Kevin B. Shelburne ; [et al.] Article en page(s) : p. 93-100 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.010 Langues : Anglais (eng) Descripteurs : HE Vinci
Force musculaireMots-clés : Alignement de l'implant Prothèse et implant Implant de la hanche Charge musculaire Charge articulaire Mécanique des joints Résumé : Background
Component alignment is an important consideration in total hip arthroplasty. The impact of changes in alignment on muscle forces and joint contact forces during dynamic tasks are not well understood, and have the potential to influence surgical decision making. The objectives of this study were to assess the impact of femoral head/stem and cup component placement on hip muscle and joint contact forces during tasks of daily living and to identify which alignment parameters have the greatest impact on joint loading.
Methods
Using a series of strength-calibrated, subject-specific musculoskeletal models of patients performing gait, sit-to-stand and step down tasks, component alignments were perturbed and joint contact and muscle forces evaluated.
Findings
Based on the range of alignments reported clinically, variation in head/stem anteversion-retroversion had the largest impact of any degree of freedom throughout all three tasks; average contact forces 413.5 (319.1) N during gait, 262.7 (256.4) N during sit to stand, and 572.7 (228.1) N during the step down task. The sensitivity of contact force to anteversion-retroversion of the head/stem was 31.5 N/° for gait, which was similar in magnitude to anterior-posterior position of the cup (34.6 N/m for gait). Additionally, superior-inferior cup alignment resulted in 16.4 (4.9)° of variation in the direction of the hip joint contact force across the three tasks, with the most inferior cup placements moving the force vector towards the cup equator at the point of peak joint contact force.
Interpretation
A quantitative understanding of the impact and potential tradeoffs when altering component alignment is valuable in supporting surgical decision making.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155818
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 93-100[article]Exemplaires (1)
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Titre : Comparison of acromiohumeral distance in symptomatic and asymptomatic patient shoulders and those of healthy controls Type de document : Article Auteurs : S. Navarro-Ledesma ; Alejandro Luque-Suarez Article en page(s) : p. 101-106 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.013 Langues : Anglais (eng) Descripteurs : HE Vinci
Rééducation et réadaptationMots-clés : Douleur de l'épaule Douleur musculosquelettique Imagerie par ultrasons Résumé : Background
The reduction of the subacromial space has traditionally been linked to rotator cuff pathology. The contribution of this narrowing, both in the development and maintenance of rotator cuff tendinopathy, is still under debate. The objective of the present study was compare the acromiohumeral distance at 0 and 60 degrees of active shoulder abduction in scapular plane, static position, in both symptomatic and contralateral shoulders, between participants with unilateral rotator cuff related shoulder pain, and in asymptomatic participants.
Method
This was a cross-sectional observational study. Seventy-six participants with chronic shoulder pain were assessed. Forty participants without shoulder pain were also recruited to compare the acromiohumeral distance with symptomatic participants. The acromiohumeral distance was measured at 0 and 60 degrees of active shoulder abduction in all the groups by ultrasound imaging. Mean differences between symptomatic versus contralateral shoulders, and versus healthy controls, were calculated.
Findings
There were no statistical significant differences (p > .05) in the acromiohumeral distance at 0 degrees of shoulder elevation between the groups. However, significant differences were found at 60° between symptomatic and contralateral shoulder groups (0,51 mm; 95% CI: −0.90 to −0.12).
Interpretations
Differences in shoulder pain perception at 0° are not attributable to acromiohumeral distance differences. However, treatments focused on increasing AHD at 60° could be prescribed, as a significantly reduced AHD was found in symptomatic shoulders when compared with contralateral shoulders. Further research is needed to determine, not only static differences in AHD, but also dynamic differences.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155819
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 101-106[article]Exemplaires (1)
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Titre : Numerical investigation of the relationship between pin deviations and joint coordinates of a unilateral external fixator Type de document : Article Auteurs : Jiangfeng Li ; Xia Zhao ; Xiaojie Hu ; [et al.] Article en page(s) : p. 107-116 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.01.024 Langues : Anglais (eng) Mots-clés : Déviation de la broche Méthodologie de cinématique inversée Fixateur externe unilatéral Articulations Résumé : Background
Fracture correction is an important orthopedic operation, which can be performed using a unilateral external fixator. Regulating the rotational and translational joints of the fixator is usually necessary to correct complex deformities. However, pin deviations inevitably occur during surgery, and the fixator has its own limitations. Therefore, the relationship between fixator joint adjustment and pin deviations must be identified and discussed.
Methods
The influence of pin deviation on the fixator joint adjustment was analyzed using the inverse kinematics method based on a 6-DOF unilateral external fixator. The effect of multiple pin deviations on fixator joint was also discussed.
Findings
This study reveals that the single pin deviations in different axes affect different fixator joints. When multiple deviations occur simultaneously, the regulated quantity is equal to the sum of that of each deviation.
Interpretation
Reasonable pin placement can reduce the joint adjustment values and prevent reaching limit values of fixator joint, which aids in expanding the application scope of the fixator. This research can also help reduce the duration of orthopedic surgeries, if the relationship between pin deviation and joint adjustment is known in advance.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155820
in Clinical Biomechanics > Vol. 53 (March 2018) . - p. 107-116[article]Exemplaires (1)
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Titre : Shoulder mechanical demands of slow underwater exercises in the scapular plane Type de document : Article Auteurs : Jessy Lauer ; Joao Paulo Vilas-Boas ; Annie Hélène Rouard Article en page(s) : -p. 117-123 Note générale : https://doi.org/10.1016/j.clinbiomech.2018.02.014 Langues : Anglais (eng) Descripteurs : HE Vinci
Epaule ; Exercice physiqueMots-clés : Thérapie aquatique Cinématique des joints Dynamique inversée Plan scapulaire Résumé : Background
The mechanical demands of underwater shoulder exercises have only been assessed indirectly via electromyographical measurements. Yet, this is insufficient to understand all the clinical implications. The purpose of this study was to evaluate musculoskeletal system loading during slow (30°/s) scapular plane arm elevation and lowering performed in two media (air vs water) and body positions (sitting vs supine).
Methods
Eighteen participants' upper bodies were scanned and virtually animated within unsteady numerical fluid flow simulations to compute hydrodynamic forces. Together with weight, buoyancy and segment inertial parameters, these were fed into an inverse dynamics model to obtain net shoulder moments, power and work.
Findings
Positive mechanical work done at the shoulder was 32.4% (95% CI [29.2, 35.6]) and 25.0% [22.8, 27.2] that when performing the same movement on land, supine and sitting respectively. Arm elevation was ~2.5* less demanding sitting than supine (mean 0.012 (SD 0.018) vs mean 0.027 (SD 0.012) J·kg−1, P = 0.034). Instantaneous power was consistently positive when sitting albeit very low during elevation (0.003 W·kg−1) whereas, when supine, it was alternately negative for short period (~1.2 s) and positive (~4.8 s), peaking at levels 3* higher (0.01 W·kg−1).
Interpretation
Performing sitting elicited concentric muscle contractions at very low effort, which is advantageous during early rehabilitation to restore joint mobility. Exercising supine, by contrast, required rapid pre-stretch followed by concentric force production at an overall higher mechanical cost, and is therefore better suited to more advanced rehabilitation stages.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155821
in Clinical Biomechanics > Vol. 53 (March 2018) . - -p. 117-123[article]Exemplaires (1)
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| Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|
| CliBio 2018 P2018/1 | Périodique papier | Woluwe | Revues-W | Consultation sur place uniquement Exclu du prêt |
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Titre : Relationship between body composition and postural control in prepubertal overweight / obese children : A cross-sectional study Type de document : Article Auteurs : Israel Villarrasa-Sapiña ; Julio Alvarez-Pitti ; Ruth Cabeza-Ruiz Article en page(s) : p. 1-6 Langues : Anglais (eng) Descripteurs : HE Vinci
Composition corporelle ; Enfant (6-12 ans) ; Obésité ; Posture ; SurpoidsMots-clés : Obesity Overweight Child Body Composition Résumé : Excess body weight during childhood causes reduced motor functionality and problems in postural control, a negative influence which has been reported in the literature. Neverthless, no information regarding the effect of body composition on the postural control of overwreight and obese children is available. The objective of this study was therefore to establich these relationship. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155887
in Clinical Biomechanics > Vol. 52 (2018) . - p. 1-6[article]Exemplaires (1)
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Titre : Quantification of upper limb electromyographic measures and dysfunction of breast cancer survivors during performance of functional dynamic tasks Type de document : Article Auteurs : Rebecca L. Brookham ; Alan C. Cudlip ; Clark R. Dickerson Article en page(s) : p. 7-13 Langues : Anglais (eng) Descripteurs : HE Vinci
Electromyographie ; Force musculaire ; Membre supérieurMots-clés : Upper Extremity Breast Cancer Lymphedema Lymphoedème après cancer du sein Electromyography Muscle Strength Résumé : Upper limb morbidities within the breast cancer population can interfere with completing daily life activities. Current knowledge of upper limb capabilities is limited; previous increases in muscle activation on the affected cancer side suggest this population works at a higher fraction of their capability. The purposes of this study were to describe upper limb capabilities and dysfunction of breast cancer survivors through muscle activation monitoring via surface electromyography and muscle-specific strength tests during functional tasks. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155888
in Clinical Biomechanics > Vol. 52 (2018) . - p. 7-13[article]Exemplaires (1)
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Titre : The quantity of bone cement influences the anchorage of augmented pedicle screws in the osteoporotic spine : A biomechanical human cadaveric study Type de document : Article Auteurs : Miguel Pishnamaz, Auteur ; Henning Lange, Auteur ; Christian Herren, Auteur Article en page(s) : p. 14-19 Langues : Anglais (eng) Descripteurs : HE Vinci
OstéoporoseMots-clés : Pedicle Screws Vis pédiculaires Osteoporosis Cadaver Cadavre Methylmethacrylate Méthacrylate de méthyle Résumé : The aim of this comparative biomechanical human cadaveric study was to investigate the anchorage of augmented screws with two different volumes of bone cement. For this purpose the effect of craniocaudal loadings on pedicle screws was evaluated and axial pullout tests were performed. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155889
in Clinical Biomechanics > Vol. 52 (2018) . - p. 14-19[article]Exemplaires (1)
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Titre : Numerical simulation of hemodynamics in membranous obstruction of the suprahepatic inferior vena cava based on a subject-specific Budd-Chiari syndrome model Type de document : Article Auteurs : Deqiang Cheng ; Yinping Zhuang ; Qiqi Kou Article en page(s) : p. 20-24 Langues : Anglais (eng) Descripteurs : HE Vinci
HemodynamiqueMots-clés : Budd-Chiari Syndrome Syndrome de Budd-Chiari Hemodynamics Vena Cava Inferior Veine cave inférieure Résumé : This study was performed to determine the hemodynamic changes of Budd-Chiari syndrome when the inferior vena vein membrane is developing. Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155890
in Clinical Biomechanics > Vol. 52 (2018) . - p. 20-24[article]Exemplaires (1)
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Titre : Different ways to balance the spine in sitting : Muscle activity in specific postures differs between individuals with and without a history of back pain Type de document : Article Auteurs : Andrew P. Claus ; Julie A. Hides ; Lorimer G. Moseley Article en page(s) : p. 25-32 Langues : Anglais (eng) Descripteurs : HE Vinci
Electromyographie ; Lombalgie ; Posture ; Rachis ; Vertèbres lombalesMots-clés : Spine Lumbar Vertebrae Low Back Pain Electromyography Résumé : Previous research explored muscle activity in four distinct sitting postures with fine-wire electromyography, and found that lumbar multifidus muscle activity increased incrementally between sitting with flat thoracolumbar and lumbar regions, long thoracolumbar lordosis, or short lordosis confined to the lumbar region. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155891
in Clinical Biomechanics > Vol. 52 (2018) . - p. 25-32[article]Exemplaires (1)
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Titre : De novo generation in an in vivo rat model and biomechanical characterization of autologous transplants for ligament and tendon reconstruction Type de document : Article Auteurs : Marc Soubeyrand ; Elisabeth Laemmel ; Nathalie Maurel Article en page(s) : p. 33-40 Langues : Anglais (eng) Descripteurs : HE Vinci
BioingeniérieMots-clés : Bioengineering Biomechanical Phenomena Phénomènes biomécaniques Ligaments Tendons Résumé : Surgical reconstruction of ligaments and tendons is frequently required in clinical practice. The commonly used autografts, allografts, or synthetic transplants present limitations in terms of availability, biocompatibility, cost, and mechanical properties that tissue bioengineering aims to overcome. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155892
in Clinical Biomechanics > Vol. 52 (2018) . - p. 33-40[article]Exemplaires (1)
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Titre : Biodegradable spacer reduces the subacromial pressure : A biomechanical cadaver study Type de document : Article Auteurs : Yan Chevalier ; Matthias F. Pietschmann ; Christoph Thorwächter Article en page(s) : p. 41-48 Langues : Anglais (eng) Descripteurs : HE Vinci
Epaule ; PressionMots-clés : Shoulder Impingement Syndrome Syndrome de conflit sous-acromial Rotator Cuff Injuries Lésions de la coiffe des rotateurs Pressure Tendons Shoulder Biomechanical Phenomena Phénomènes biomécaniques Résumé : Failure after rotator cuff repair remains a major clinical problem and could be related to excessive pressures from the acromion. Previous studies with irreparable tears showed good clinical results of tendon healing with arthroscopic insertion of a protective biodegradable spacer balloon between the repaired tendon and the acromion. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155893
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Titre : Analysis of the elastic bending characteristics of cementless short hip stems considering the valgus alignment of the prosthetic stem Type de document : Article Auteurs : Alexander Jahnke ; Carlos A. Fonseca Ulloa ; Jörn Bengt Seeger Article en page(s) : p. 49-56 Langues : Anglais (eng) Descripteurs : HE Vinci
Prothèse de hancheMots-clés : Hip Prosthesis Shear Strength Résistance au cisaillement Résumé : The resultant hip force causes a varus torque which must be compensated by a shear force couple depending on the stem alignment of the prosthesis. Since the prosthesis is substantially less flexible than the bone, the interior of the femur is stiffened over the entire prosthesis length. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155894
in Clinical Biomechanics > Vol. 52 (2018) . - p. 49-56[article]Exemplaires (1)
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Titre : Achievable accuracy of hip screw holding power estimation by insertion torque measurement Type de document : Article Auteurs : Paolo Erani ; Massimiliano Baleani Article en page(s) : p. 57-65 Langues : Anglais (eng) Descripteurs : HE Vinci
Prothèse de hancheMots-clés : Bone Screws Vis orthopédiques Torque Moment de torsion Hip Prosthesis Résumé : To ensure stability of proximal femoral fractures, the hip screw must firmly engage into the femoral head. Some studies suggested that screw holdind power into trabecular bone could be evaluated, intraoperatively, through measurement of screw insertion torque. However, those studies used synthetic bone, instead of trabecular bone, as host material or they did not evaluate accuracy of predictions. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155895
in Clinical Biomechanics > Vol. 52 (2018) . - p. 57-65[article]Exemplaires (1)
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Titre : An index to quantify deviations from normal trunck mobility : Clinical correlation and initial test of validity Type de document : Article Auteurs : Yannick Delpierre ; Michel Ritz ; Cyril Garnier Article en page(s) : p. 66-71 Langues : Anglais (eng) Descripteurs : HE Vinci
LombalgieMots-clés : Low Back Pain Multivariate Analysis Analyse multivariée Biomechanical Phenomena Phénomènes biomécaniques Résumé : In case of people suffering from chronic low back pain, specific movements of the hip, pelvis, and trunck are associated with pain. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155896
in Clinical Biomechanics > Vol. 52 (2018) . - p. 66-71[article]Exemplaires (1)
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Titre : Biomechanical evaluation of pyrocarbon proximal interphalangeal joint arthroplasty : An in-vitro analysis Type de document : Article Auteurs : A. Completo ; A. Nascimento ; A.F. Girao Article en page(s) : p. 72-78 Langues : Anglais (eng) Mots-clés : Biomechanical Phenomena Phénomènes biomécaniques Finger Joint Articulation du doigt Arthroplasty Replacement Arthroplastie prothétique Finger Arthroplastie prothétique de doigt Résumé : Pyrocarbon proximal interphalangeal joint arthroplasty provided patients with excellent pain relief and joint motion, however, overall complications have been very variable, with some good outcomes at short-medium-term follow-up and some bad outcomes at longer-term follow-up. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155897
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Titre : The effects of body weight unloading on kinetics and muscle activity of overweight males during overground walking Type de document : Article Auteurs : Arielle G. Fischer ; Alon Wolf Article en page(s) : p. 80-85 Langues : Anglais (eng) Descripteurs : HE Vinci
Electromyographie ; Poids du corps ; Rééducation et réadaptationMots-clés : Body Weight Electromyography Kinetics Cinétique Biomechanical Phenomena Phénomènes biomécaniques Gait Démarche Résumé : Excess body weight has become a major worldwide health and social epidemic. Training with body weight unloading, is a common method for gait corrections for various neuromuscular impairments. In the present study we assessed the effects of body weight unloading on knee and ankle kinetics and muscle activation of overweight subjects walking overground under various levels of body weight unloading. Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155898
in Clinical Biomechanics > Vol. 52 (2018) . - p. 80-85[article]Exemplaires (1)
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Titre : Biomechanics of a cemented short stem : Standard vs. line-to-line cementation techniques. A biomechanical in-vitro study involving six osteoporotic pairs of human cadaver femurs Type de document : Article Auteurs : Karl Philipp Kutzner ; Tobias Freitag ; Ralf Bieger Article en page(s) : p. 86-94 Langues : Anglais (eng) Mots-clés : Arthroplasty Replacement Hip Arthroplastie prothétique de hanche Biomechanical Phenomena Phénomènes biomécaniques Résumé : Short-stem total hip arthroplasty (THA) potentially offers advantages compared to conventional THA, including sparing bone and soft tissue and being a facilitated and less traumatic implantation. However, the indication is limited to patients with sufficient bone quality. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155899
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Titre : Local bone quality measurements correlates with maximum screw torque at the femoral diaphysis Type de document : Article Auteurs : Christopher M. McAndrew ; Avinesh Agarwalla ; Adam C. Abraham Article en page(s) : p. 95-99 Langues : Anglais (eng) Descripteurs : HE Vinci
Diaphyse ; FémurMots-clés : Bone Screws Vis orthopédiques Torque Moment de torsion Diaphyses Résumé : Successful fracture fixation depends critically on the stability of the screw-bone interface. Maximum achievable screw torque reflects the competence of this interface, but it cannot be quantified prior to screw stripping. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155900
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Titre : Biomechanical and physiological age differences in a simulated forward fall on outstretched hands in women Type de document : Article Auteurs : Lauren J. Lattimer ; Joel L. Lanovaz ; Jonathan P. Farthing Article en page(s) : p. 102-108 Langues : Anglais (eng) Descripteurs : HE Vinci
Main ; Posture ; Sujet âgéMots-clés : Accidental Falls Chutes accidentelles Aged Women Femmes Motor Skills Aptitudes motrices Hand Résumé : Falling on the outstretched hands, a protective mechanism to arrest the body and avoid injury, requires upper limb and trunck motor control for effective body descent. Older women are particularly susceptible to injury from a forward fall, but the biomechanical and physiological (e.g., muscle strength) factors related to this increased risk are poorly understood. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155901
in Clinical Biomechanics > Vol. 52 (2018) . - p. 102-108[article]Exemplaires (1)
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Titre : The influence of internal and external tibial rotation offsets on knee joint and ligament biomechanics during simulated athletic tasks Type de document : Article Auteurs : Nathaniel A. Bates ; Rebecca J. Nesbitt ; Jason T. Shearn Article en page(s) : p. 109-116 Langues : Anglais (eng) Descripteurs : HE Vinci
RobotiqueMots-clés : Anterior Cruciate Ligament Ligament croisé antérieur Medial Collateral Ligament Knee Ligament collatéral tibial du genou Robotics Résumé : Following anterior cruciate ligament injury and subsequent reconstruction transverse plane tibiofemoral rotation becomes underconstrained and overconstrained, respectively. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155902
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Titre : A method for characterizing essential tremor from the shoulder to the wrist Type de document : Article Auteurs : Daniel W. Geiger ; Dennis L. Eggett ; Steven K. Charles Article en page(s) : p. 117-123 Langues : Anglais (eng) Descripteurs : HE Vinci
Membre supérieurMots-clés : Essential Tremor Tremblement essentiel Upper Extremity Biomechanical Phenomena Phénomènes biomécaniques Résumé : Despite the pervasive and devastating effect of Essential Tremor (ET), the distribution of ET throughout the upper limb is unknown. We developed a metho for characterizing the distribution of ET and performed a preliminary characterization in a small number of subjects with ET. (...) Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155903
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| Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|
| CliBio 2018 P2018/2 | Périodique papier | Woluwe | Revues-W | Consultation sur place uniquement Exclu du prêt |
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Titre : Evaluation of interference fit and bone damage of an uncemented femoral knee implant Type de document : Article Auteurs : Sanaz Berahmani ; Maartje Hendriks ; Joost J.A. de Jong Article en page(s) : p. 1-9 Note générale : https://doi.org/10.1016/j.clinbiomech.2017.10.022 Langues : Anglais (eng) Descripteurs : HE Vinci
Densite osseuse ; GenouMots-clés : Endommagement osseux Prothèses Ajustement par pression Résumé : Background
During implantation of an uncemented femoral knee implant, press-fit interference fit provides the primary stability. It is assumed that during implantation a combination of elastic and plastic deformation and abrasion of the bone will occur, but little is known about what happens at the bone-implant interface and how much press-fit interference fit is eventually achieved.
Methods
Five cadaveric femora were prepared and implantation was performed by an experienced surgeon. Micro-CT- and conventional CT-scans were obtained pre- and post-implantation for geometrical measurements and to measure bone mineral density. Additionally, the position of the implant with respect to the bone was determined by optical scanning of the reconstructions. By measuring the differences in surface geometry, assessments were made of the cutting error, the actual interference fit, the amount of bone damage, and the effective interference fit.
Findings
Our analysis showed an average cutting error of 0.67 mm (SD 0.17 mm), which pointed mostly towards bone under-resections. We found an average actual AP interference fit of 1.48 mm (SD 0.27 mm), which was close to the nominal value of 1.5 mm.
Interpretation
We observed combinations of bone damage and elastic deformation in all bone specimens, which showed a trend to be related with bone density. Higher bone density tended to lead to lower bone damage and higher elastic deformation. The results of the current study indicate different factors that interact while implanting an uncemented femoral knee component. This knowledge can be used to fine-tune design criteria of femoral components to achieve adequate primary stability for all patients.Disponible en ligne : Non Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=155860
in Clinical Biomechanics > Vol. 51 (January 2018) . - p. 1-9[article]Exemplaires (1)
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Titre : Finite element simulation on posterior tibial tendinopathy : Load transfer alteration and implications to the onset of pes planus Type de document : Article Auteurs : Duo Wai-Chi Wong ; Yang Wang ; Aaron Kam-Lun Leung ; [et al.] Article en page(s) : p. 10-16 Note générale : https://doi.org/10.1016/j.clinbiomech.2017.11.001 Langues : Anglais (eng) Mots-clés : Tendinopathie tibiale dysfonctionnement du tendon postérieur du tibia Pied plat Résumé : Background
Posterior tibial tendinopathy is a challenging foot condition resulting in pes planus, which is difficult to diagnose in the early stage. Prior to the deformity, abnormal internal load transfer and soft tissue attenuation are anticipated. The objective of this study was to investigate the internal load transfer and strain of the ligaments with posterior tibial tendinopathy, and the implications to pes planus and other deformities.
Methods
A three-dimensional finite element model of the foot and ankle was reconstructed from magnetic resonance images of a 28-year-old normal female. Thirty bones, plantar fascia, ligaments and tendons were reconstructed. With the gait analysis data of the model subject, walking stance was simulated. The onset of posterior tibial tendinopathy was resembled by unloading the tibialis posterior and compared to the normal condition.
Findings
The load transfer of the joints at the proximal medial column was weaken by posterior tibial tendinopathy, which was compromised by the increase along the lateral column and the intercuneiforms during late stance. Besides, the plantar tarsometatarsal and cuboideonavicular ligaments were consistently over-stretched during stance. Particularly, the maximum tensile strain of the plantar tarsometatarsal ligament was about 3-fold higher than normal at initial push-off.
Interpretation
Posterior tibial tendinopathy altered load transfer of the medial column and unbalanced the load between the proximal and distal side of the medial longitudinal arch. Posterior tibial tendinopathy also stretched the midfoot plantar ligaments that jeopardized midfoot stability, and attenuated the transverse arch. All these facto