Article

AIM: To investigate whether total knee arthroplasty (TKA) was associated with
stability in single-limb stance and whether reduced stability in single-limb
stance was associated with increased postural sway in bilateral quiet standing.
METHODS: 3D kinematics for center of mass was used to assess postural sway in 23
subjects with TKA and 23 controls. Tests included bilateral quiet standing with
and without vision and on a compliant surface, and single-limb stance. RESULTS:
30% of the subjects in the TKA group were unable to maintain single-limb stance
for 20s on any leg. Of the 70% in the TKA group able to stand on one leg, mean
sway velocity in the medio-lateral direction was marginally higher for the
prosthetic side (p=.02), but no differences were found between the TKA and the
control group in single-limb stance. Performance in bilateral quiet standing was
similar in TKA-subjects, able as well as unable to stand on one leg, and
controls. Reduced quadriceps strength in the contralateral leg, higher BMI, and
older age predicted failure to maintain single-limb stance. CONCLUSION: In
subjects able to stand on one leg, performance was considered comparable between
the prosthetic and contralateral side and between groups. Inability to stand on
one leg did not affect postural sway in bilateral quiet standing. The results
suggest that inability to maintain single-limb stance is explained by reduced
physical capacity rather than the knee condition in itself. The present study
emphasizes the importance of physical activity to improve strength and functional
capacity.
CI - Copyright (c) 2015 Elsevier B.V. All rights reserved.

Langue : ANGLAIS