Estimation of the body center of mass velocity during gait of people with transfemoral amputation from force plate data integration
Article dans une revue avec comité de lecture
Background: Body Center Of Mass velocity assessment is a prerequisite for several applications in prosthetic control and rehabilitation monitoring. Force plate data integration is a promising alternative to full-body quantitative analysis of segmental kinematics to estimate the velocity. Still, it remains to be implemented and validated for people with transfemoral amputation. Methods: Two methods were used (force plate based and pelvic markers based) for Body Center Of Mass velocity estimation in a clinical context. The two methods were comparatively assessed on overground walking data of eight people with transfemoral amputation in a laboratory equipped with a motion capture system and force plates compared to reference estimation derived from a full body segmental gait analysis. The ‘Methods’ agreement with the reference was quantified from the Bland and Altman procedure. Findings: The estimation of Body Center Of Mass velocity from force plate data integration was considered acceptable in terms of limits of agreement. In addition, the hypotheses used to determine integration constants were evaluated and shown to be reasonable as far as the walking direction is well controlled. Interpretation: Results demonstrate the possibility to use the force plate method to assess the Body Center Of Mass velocity of people with transfemoral amputation for straight walking on level ground. An estimation from the velocity of pelvic markers can also be a relevant alternative as soon as the walking velocity remains low. Further investigation will deal with the impact of the errors on the computation of derived parameters such as individual limb power.
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Evolution of vaulting strategy during locomotion of individuals with transfemoral amputation on slopes and cross-slopes compared to level walking Article dans une revue avec comité de lectureVILLA, Coralie; DREVELLE, Xavier; BONNET, Xavier; LAVASTE, François; LOIRET, Isabelle; FODÉ, Pascale; PILLET, Hélène (Elsevier BV, 2015)Background: Vaulting is a walking strategy qualitatively characterized in clinics by the sound ankle plantiflexion in midstance to assist prosthetic foot clearance. Even though potentially harmful, this strategy is often ...
Article dans une revue avec comité de lecturePILLET, Hélène; DREVELLE, Xavier; BONNET, Xavier; VILLA, Coralie; MARTINET, Noël; SAURET, Christophe; BASCOU, Joseph; LOIRET, Isabelle; DJIAN, Francis; RAPIN, Nathalie; MILLE, Jacky; THOREUX, Patricia; FODÉ, Pascal; PAYSANT, Jean; GUÉRIT, Philippe; LAVASTE, François (Elsevier BV, 2014)Today, the prevalence of major amputation in France can be estimated between 90,000 and 100,000 and the incidence is about 8300 new amputations per year (according to French National Authority for Health estimation). This ...
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Mechanical work performed by individual limbs of transfemoral amputees during step-to-step transitions: Effect of walking velocity Article dans une revue avec comité de lectureBONNET, Xavier; VILLA, Coralie; FODÉ, Pascale; LAVASTE, François; PILLET, Hélène (SAGE Publications, 2014)The greater metabolic demand during the gait of people with a transfemoral amputation limits their autonomy and walking velocity. Major modifications of the kinematic and kinetic patterns of transfemoral amputee gait ...
Article dans une revue avec comité de lectureVILLA, Coralie; LOIRET, Isabelle; LANGLOIS, Karine; BONNET, Xavier; LAVASTE, François; FODÉ, Pascale; PILLET, Hélène (Elsevier BV, 2017)Objective To quantitatively analyze prosthetic limb swing phase gait strategies used to adapt to cross slopes compared with flat surfaces. Design Cross-sectional study. Setting Gait laboratory. Participants A volunteer ...