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Predicted knee kinematics and kinetics during functional activities using motion capture and musculoskeletal modelling in healthy older people

WORSLEY P; STOKES M; TAYLOR M
GAIT POSTURE , 2011, vol. 33, n° 2, p. 268-273
Doc n°: 151000
Localisation : Documentation IRR

D.O.I. : http://dx.doi.org/DOI:10.1016/j.gaitpost.2010.11.018
Descripteurs : MA - GERONTOLOGIE, DE51-ETUDES GENERALITES - GENOU

Knowledge of joint forces and moments is essential for comparisons between
healthy people and those with pathological conditions, with observed changes at
joints providing basis for a particular intervention. Currently the literature
analysing both kinematics and kinetics at the knee has been limited to small
samples, typically of young subjects or those who have undergone joint
arthroplasty. In this study, we examined tibiofemoral joint (TFJ) kinematics and
kinetics during gait, sit-stand-sit, and step-descent in 20 healthy older
subjects (aged 53-79 years) using motion capture data and inverse dynamic
musculoskeletal models. Mean peak distal-proximal force in the TFJ were 3.1, 1.6,
and 3.5 times body weight (N/BW) for gait, sit-stand, and step-descent
respectively. There were also significant posterior-anterior forces, with
sit-stand activity peaking at 1.6 N/BW. Moments about the TFJ peaked at a mean of
0.07 Nm/BW during the sit-stand activity. One of the most important findings of
this study was variability found across the subjects, who spanned a wide age
range, showing large standard deviations in all of the activities for both
kinematics and kinetics. These data have provided an initial prediction for
assessing kinematics and kinetics in the older population. Larger studies are
needed to refine the database, in particular to reduce the variability in the
results by studying sub-populations, to enable more robust comparisons between
healthy and pathological TFJ kinematics and kinetics.
CI - Copyright (c) 2010 Elsevier B.V. All rights reserved.

Langue : ANGLAIS

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