Article

This study investigated the full-body strategies utilized during a sit-to-stand
(STS) task in patients with knee osteoarthritis (OA) and the association between
STS alterations and clinical measurements. Twenty-five patients with advanced
knee OA and twenty healthy elderly adults were recruited to participate in this
study. Patients were asked to stand up from a chair four times without using
their arms. A 3D motion analysis system was used to capture the full-body
kinematics during the task. Two force plates were used to capture the forces
under each leg. The following parameters were investigated in the knee OA group
and compared with the control group: the time to realize STS, the force ratio
between both limbs, the knee and hip kinetics and the trunk kinematics. The pain
and functional capacity were obtained from the WOMAC.
The results showed that
patients with knee OA put 10% additional weight on the contralateral side when
compared with the symmetrical strategy of the control group. Patients with knee
OA showed a significantly lower knee flexion moment (0.51 Nm/kg vs. 0.72 Nm/kg),
a higher maximal trunk flexion (46.4 degrees vs. 37.5 degrees ), and a higher
lateral trunk lean on the contralateral side (2.4 degrees vs. 0.9 degrees ) when
compared with the control group. The main correlations were found between pain
and the averaged time to complete the STS task (r=0.55). With the quantification
of the full-body mechanisms utilized during the STS task, which includes both
distal and proximal compensations, our study brings new insights, leading to a
better understanding of the functional alterations in patients with advanced knee OA.
CI - Copyright (c) 2012 Elsevier B.V. All rights reserved.

Langue : ANGLAIS