Article

OBJECTIVE: To investigate which of the 2 muscle-impairment measures for the
operated leg, normalized knee extension strength or leg press power, was most
closely associated with performance-based and self-reported measures of function
shortly after total knee arthroplasty (TKA). DESIGN: Cross-sectional, exploratory
study. SETTING: Laboratory at a regional hospital. PARTICIPANTS: Individuals
(N=39) with an average age +/- SD of 65.5+/-10.3 years, who all had unilateral TKA 28 days prior. INTERVENTIONS: None. MAIN : The patients
performed maximal isometric knee extensions and dynamic leg presses to determine
their body-mass normalized knee extension strength and leg press power,
respectively. The 10-meter fast speed walking- and 30-second chair stand tests
were used to determine performance-based function, while the Western Ontario and
McMaster Universities Osteoarthritis Index and Oxford Knee Scores were used to
determine self-reported function. RESULTS: Normalized leg press power was more
closely associated with both performance-based (r=.82, P<.001) and self-reported
(r=.48, P=.002) measures of function compared with normalized knee extension
strength (r=.51, P=.001 and r=.39, P=.015, respectively). CONCLUSIONS: Normalized
leg press power was more closely associated with both performance-based and
self-reported function early after TKA than normalized knee extension strength.
It may be explained by the fact that performance-based measures of function are
typically closed kinetic chain tasks, such as walking or rising from a chair, and
self-reported measures of function typically include questions that address
perceived difficulty with performing these same tasks.
CI - Copyright (c) 2013 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS