Article

OBJECTIVE: To determine whether muscle strength in patients scheduled for total
knee arthroplasty is: (i) strongly associated with both measured functional
performance and patient-reported measures; (ii) more closely associated with
functional performance when measured during concentric than during isometric
contractions; and (iii) more strongly related to the 30-s chair stand test than
to the timed-up-and-go and walking measures. DESIGN: Cross-sectional-study.
PATIENTS: Fifty-nine patients (36 women, 23 men), mean age 70.4 years. METHODS:
Associations between muscle strength, measured functional performance, and
patient-reported measures were calculated. RESULTS: Both knee extensor and knee
flexor strength were associated with performance-based measures. In general,
concentric knee flexor muscle strength was more strongly associated with
functional performance than was isometric knee flexor strength. Concentric and
isometric knee extensor strength were of equal importance. The 30-s chair stand
test was better than the timed-up-and-go and the walking tests at determining
muscle strength. CONCLUSION: Future rehabilitation programmes should include both
the knee extensor muscles and the knee flexor muscles in order to improve
functional performance. The 30-s chair stand test is a valid and clinical
relevant proxy measure of knee extensor and knee flexor muscle strength.

Langue : ANGLAIS