Article

OBJECTIVE: (1) To determine the interrater reliability and measurement error of
an 11-step stair ascend/descend test (STTotal-11) and stair up (ascend) test
(STUp-11); (2) to seek evidence for the STTotal-11 and STUp-11 as valid measures
of physical function by determining if they relate to measures of physical
function and do not relate to measures not of physical function; and (3) to
explore if the STTotal-11 and STUp-11 scores relate to lower-extremity muscle
weakness and knee range of motion (ROM) in subjects with total knee arthroplasty
(TKA). DESIGN: Cross-sectional study. SETTING: Academic center. PARTICIPANTS:
Subjects (N=43, 30 women; mean age, 68+/-8y) with unilateral TKA. INTERVENTIONS:
Not applicable. MAIN OUTCOME MEASURES: STTotal-11 and STUp-11 were performed
twice, and scores were compared with scores on 4 lower extremity
performance-based tasks, 2 patient-reported questionnaires of physical function,
3 psychologic factors, knee ROM, and strength of quadriceps, hip extensors, and
abductors. RESULTS: Intraclass correlation coefficient was .94 for both the
STTotal-11 and STUp-11, standard error of measurements were 1.14 seconds and .82
seconds, and minimum detectable change associated with 90% confidence interval
was 2.6 seconds and 1.9 seconds, respectively. Correlations between stair tests
and performance-based measures and knee and hip muscle strength ranged from
Pearson correlation coefficient (r)=.40 to .78. STTotal-11 and STUp-11 had a
small correlation with one of the patient-reported measures of physical function.
Stair tests were not associated with psychologic factors and knee extension ROM
and were associated with knee flexion ROM. CONCLUSIONS: STTotal-11 and STUp-11
have good interrater reliability and minimum detectable changes adequate for
clinical use. The pattern of associations supports the validity of the stair
tests in TKA.
CI - Copyright 2010 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS