QUESTION: Does behavioural graded activity result in better exercise adherence and more physical activity than usual care in people with osteoarthritis of the hip or knee? DESIGN: Analysis of secondary outcomes of a cluster-randomised trial with concealed allocation, assessor blinding, and intention-to-treat analysis. PARTICIPANTS: Two hundred patients with hip and/or knee osteoarthritis. INTERVENTION: Experimental group received 18 sessions of behavioural graded activity over 12 weeks and up to 7 booster sessions over the next year. The control group received 18 sessions of usual care over 12 weeks according to the Dutch physiotherapy guideline. OUTCOME MEASURES: Exercise adherence was measured using a questionnaire and physical activity was measured using the SQUASH questionnaire at baseline, 13, and 65 weeks. RESULTS: Adherence to recommended exercises was significantly higher in the experimental group than in the control group at 13 weeks (OR 4.3, 95% CI 2.1 to 9.0) and at 65 weeks (OR 3.0, 95% CI 1.5 to 6.0). Significantly more of the experimental than the control group met the recommendations for physical activity at 13 weeks (OR 5.3, 95% CI 1.9 to 14.8) and at 65 weeks (OR 2.9, 95% CI 1.2 to 6.7). CONCLUSION: Behavioural graded activity results in better exercise adherence and more physical activity than usual care in people with osteoarthritis of the hip or knee, both in the short- and long-term. TRIAL REGISTRATION: NCT00522106.

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