Journal
JOURNAL OF REHABILITATION MEDICINE
Volume 46, Issue 10, Pages 997-1005Publisher
FOUNDATION REHABILITATION INFORMATION
DOI: 10.2340/16501977-1864
Keywords
reproducibility of results; osteoarthritis; hip
Categories
Funding
- Danish Foundation TrygFonden [1190-09]
- Nordea Foundation
- Health Foundation [2009B097]
- Danish Rheumatism Association [R56-Rp2380]
- Lundbeck Foundation [FP50/2009]
- School of Physical Therapy in Copenhagen
- Association of Danish Physiotherapists Research Fund
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Objective: To investigate the reliability and agreement of measures of lower extremity muscle strength, power and functional performance in patients with hip osteoarthritis at different time intervals, and to compare these with the same measures in healthy peers. Design: Intra-rater test-retest separated by 1, 2, or 2.5 weeks in patients, and 1 week in healthy peers. Subjects: Patients with hip osteoarthritis (age range 61-83 years) with 1 (n = 37), 2 (n = 35), or 2.5 weeks (n = 15) between tests, and 35 healthy peers (age range 63-82 years). Methods: Maximal isometric hip and thigh strength, leg extensor power, and functional performance (8-foot Up & Go, stair climbing, chair stand and 6-min walk) were measured in patients, and quadriceps strength, leg extensor power and functional performance were measured in healthy peers. Systematic error, reliability and agreement were calculated. Results: Most hip strength measurements for the most symptomatic extremity, and nearly all strength measurements for the least symptomatic lower extremity, declined after 1 week (p < 0.05), but not after a 2.5-week interval. In healthy peers, quadriceps strength was unchanged. Regardless of the time interval, leg extensor power was unchanged, while functional performances improved at retest for all participants. Conclusion: In patients with hip osteoarthritis leg extensor power is unaffected by the time interval between tests, in contrast to muscle strength and functional performance.
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