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  • Title: Physical function in hip osteoarthritis: relationship to isometric knee extensor steadiness.
    Author: Pua YH, Clark RA, Bryant AL.
    Journal: Arch Phys Med Rehabil; 2010 Jul; 91(7):1110-6. PubMed ID: 20599051.
    Abstract:
    OBJECTIVE: To evaluate, in a community hip osteoarthritis sample, the cross-sectional associations of isometric strength and steadiness of the knee extensors and their interaction with physical performance measures of physical function. DESIGN: Cross-sectional. SETTING: Human movement laboratory of a university. PARTICIPANTS: Sixty-seven adults (27 men and 40 women; age, 61+/-10 y) with radiographically confirmed symptomatic hip osteoarthritis. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Participants performed isometric knee extensor steadiness and strength testing on a dynamometer. Physical function was assessed by using the habitual timed walk test and the self- and fast-paced stair-climbing tests. RESULTS: In the hierarchical regression models, although there were clear main effects of knee extensor steadiness on fast-paced stair performance, greater knee steadiness predictively associated with faster stair-climbing performance particularly in individuals with high knee extensor strength. In contrast, knee extensor steadiness was not related to gait speed regardless of knee extensor strength levels. CONCLUSIONS: In patients with hip OA, knee extensor steadiness was positively associated with stair-climbing performance, particularly in those with high levels of knee extensor strength. These findings are of importance in developing intervention strategies, but they call for further study.
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