Association Between Chair Stand Strategy and Mobility Limitations in Older Adults with Symptomatic Knee Osteoarthritis

Publication year: 2012
Source:Archives of Physical Medicine and Rehabilitation

Neil A. Segal, Elizabeth R. Boyer, Robert Wallace, James C. Torner, H. John Yack

Objective To determine which lower limb strength and joint kinetic and kinematic parameters distinguish sit-to-stand (STS) performance of older adults with symptomatic knee osteoarthritis (OA) with higher and lower chair stand time. Design Cross-sectional. Setting Motion analysis laboratory. Participants Age 50-79 years with radiographic knee OA and daily symptoms, stratified by chair stand times. Interventions Not applicable. Main Outcome Measure(S) Lower limb strength and STS strategy. Results Data were available for 49 participants (26M/23F) age 64.7±8.1 years. The respective mean±SD for chair stand times in the high, moderate and low functioning groups in men were 6.5±0.7, 8.6±0.7, and 11.5±1.3sec and in women were 7.6±1.2, 10.0±0.5, and 12.8±1.8sec. Chair stand time (p=0.0391) and all measures of lower limb strength (all p<0.0001) differed by sex. In men, no strength measure differed between groups, whereas in women hip abductor strength on the more affected side differed between groups. In men, sagittal hip ROM (p=0.0122) differed between groups and there was a trend towards a difference in sagittal knee power (p=0.0501) during STS, while, in women, only sagittal knee ROM (p=0.0392) differed between groups. Conclusion (S): Higher and lower functioning adults with symptomatic knee OA appear to use different strategies when standing from a chair. Higher functioning men flexed more at the hip and produced greater knee power than lower functioning men. Higher functioning women used less knee flexion than lower functioning women. As STS is an important mobility task, these parameters may serve as foci for rehabilitation aimed at reducing mobility limitations.

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