Article

OBJECTIVES: To determine the extent of asymmetrical deficits in knee extensor and
flexor muscles, and to examine whether asymmetrical muscle deficits are
associated with mobility limitations in persons with late-stage knee
osteoarthritis (OA). DESIGN: Cross-sectional. SETTING: Research laboratory.
PARTICIPANTS: A clinical sample (N=56; age range, 50-75y) of eligible persons
with late-stage knee OA awaiting knee replacement. INTERVENTIONS: Not applicable.
MAIN OUTCOME MEASURES: Knee extensor and flexor power and torque assessed
isokinetically; thigh muscle cross-sectional area (CSA) assessed by computed
tomography; mobility limitation assessed by walking speed and stair ascension
time; and pain assessed with the Western Ontario and McMaster Universities
Osteoarthritis Index questionnaire. RESULTS: The asymmetrical deficits in knee
extensor and flexor power and torque were between 18% and 29% (P<.001). Regarding
the thigh muscle CSA, the asymmetrical deficit was 4% (P<.001). Larger
asymmetrical knee extensor power deficits and weaker knee extensor and flexor
power on the contralateral side were associated with slower stair ascension
times. Moreover, weaker knee extensor and flexor power on the ipsilateral side
were associated with slower stair ascension times. Greater knee pain in the OA
joint was independently associated with slower stair ascending time in both
models. CONCLUSIONS: The knee extensor and flexor muscle power of both the
ipsilateral and contralateral sides and the pain in the OA knee were
independently associated with stair ascension times. These results highlight the
importance of assessing muscle power on both sides and knee pain in the
prevention of mobility limitations in patients with knee OA.
CI - Copyright (c) 2015 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS