Hip Abductor Strength Reliability and Association With Physical Function After Unilateral Total Knee Arthroplasty: A Cross-Sectional Study

Figures

Figure.

Setup used to measure hip abductor strength by handheld dynamometry.

Table 1.

Characteristics of Participants Recruited for Reliability Testing (n=15)^{^a}

↵^a Values are reported as mean (standard deviation) unless otherwise indicated.

Table 2.

Test-Retest Results for Hip Abductor Strength^{^a}

↵^a CI=confidence interval, ICC=intraclass correlation coefficient, SEM=standard error of measurement, MDC₉₅=minimal detectable change with 95% confidence.

Table 3.

Characteristics of Participants Recruited for Testing Contribution of Hip Abductor Strength to Physical Function (N=210)^{^a}

↵^a Values are reported as mean (standard deviation) unless otherwise indicated. Op=“operated” (ie, the limb that had undergone surgery), Non-op=“nonoperated” (ie, the limb that had not undergone surgery), quad=quadriceps muscle, ABD=abductor, TUG=Timed “Up & Go” Test, SCT=Stair Climbing Test, 6MWT=Six-Minute Walk Test, KOS-ADLS=Knee Outcome Survey Activities of Daily Living Scale, GRS=Global Rating Scale.
^b Reported as median (25th percentile, 75th percentile) score (possible scores=0–5).

Table 4.

Bivariate Correlations Among Variables (N=210)^{^a}

↵^a Op=“operated” (ie, the limb that had undergone surgery), Non-op=“nonoperated” (ie, the limb that had not undergone surgery), quad=quadriceps muscle, ABD=abductor, TUG=Timed “Up & Go” Test, SCT=Stair Climbing Test, 6MWT=Six-Minute Walk Test, KOS-ADLS=Knee Outcome Survey Activities of Daily Living Scale, GRS=Global Rating Scale.
^b P<.01.
^c P<.05.

Table 5.

Hierarchical Linear Regression Predicting Physical Function (N=210)^{^a}

↵^a TUG=Timed “Up & Go” Test, non-op=“nonoperated” (ie, the limb that had not undergone surgery), Op=“operated” (ie, the limb that had undergone surgery), SCT=Stair Climbing Test, 6MWT=Six-Minute Walk Test, KOS-ADLS=Knee Outcome Survey Activities of Daily Living Scale, GRS=Global Rating Scale.

Files in this Data Supplement:

eTable and eFigure (PDF) (111 KB) - This PDF contains the following eTable and eFigure:
- eTable. Hierarchical Linear Regression Predicting Physical Function With Hip Abductor Strength Entered as an Independent Variable Before Quadriceps Muscle Strength
- eFigure. Bland-Altman plot of the difference (vertical axis) versus the mean (horizontal axis) for measurements obtained in the first testing session (test 1) and in the second testing session (test 2).