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Phys Ther. 2014 Jun;94(6):866-74. doi: 10.2522/ptj.20130385. Epub 2014 Feb 20.

Validity and reliability of the community balance and mobility scale in individuals with knee osteoarthritis.

Author information

J. Takacs, MSc, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada.
S.J. Garland, PT, PhD, Department of Physical Therapy, University of British Columbia.
M.G. Carpenter, PhD, School of Kinesiology, University of British Columbia.
M.A. Hunt, PT, PhD, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z3.



There is a high incidence of falls in older adults with knee osteoarthritis (OA). Adequate dynamic balance and mobility reduce the risk of falls; however, there are currently no validated, advanced tests of dynamic balance and mobility for individuals with knee OA.


The purpose of this study was to determine the convergent validity, known-groups validity, and test-retest reliability of a dynamic test of balance and mobility, the Community Balance and Mobility Scale (CB&M), in a knee OA population.


A cross-sectional design was used.


Twenty-five individuals aged 50 years and older with medial knee OA and an equal number of healthy controls completed the CB&M and other tests of balance and mobility, including the Berg Balance Scale, the Timed "Up & Go" Test, a test of maximal single-leg stance time, and the 10-Meter Walk Test (self-selected and fast walking speed). Convergent validity of balance tests with the CB&M was assessed using Pearson product moment correlation coefficients, and known-groups validity was assessed using independent t tests. Test-retest reliability of the CB&M was assessed using intraclass correlation coefficients (ICCs) and standard error of measurement (SEM).


Scores on the CB&M were significantly correlated with all measures of balance and mobility for those with knee OA. There were significant differences in CB&M scores between groups. Scores on the CB&M were highly reliable in people with knee OA (ICC=.95, 95% confidence interval [95% CI]=0.70 to 0.99; SEM=3, 95% CI=2.68 to 4.67).


Few participants had severe knee OA.


The CB&M displayed moderate convergent validity, excellent known-groups validity, and high test-retest reliability. The CB&M can be used as a valid and reliable tool to assess dynamic balance and mobility deficits in people with knee OA.

[Indexed for MEDLINE]
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