Influence of various recruitment strategies on the study population and outcome of a randomized controlled trial involving patients with osteoarthritis of the hip or knee.

OBJECTIVE To examine the effect of 2 different recruitment methods on the characteristics of participants with osteoarthritis (OA) of the hip or knee and on the efficacy of an exercise program. METHODS In a clinical trial on the effectiveness of exercise therapy in OA of the hip or knee, 2 groups of patients were recruited: one group through referrals by… (More)