89 patients with patellofemoral pain syndrome were randomized to receive one of three treatments to assess the efficacy of hip adduction exercise in this population. The first group underwent a hip adduction and leg press exercise program, the second group underwent just a leg press exercise program, and the third group received no exercise training. The results from this study, taken over 8 weeks, indicated that both exercise groups demonstrated significant improvements in pain scores and quadriceps leg muscle girth. These findings also indicated no additional benefits of the hip adduction exercises.