Clijsen R, Fuchs J, Taeymans J. Effectiveness of exercise therapy in treatment of patients with patellofemoral pain syndrome: systematic review and meta-analysis. Phys Ther. 2014;94:1697–1708.

In the December 2014 issue, PTJ published a systematic review by Clijsen and colleagues,¹ “Effectiveness of Exercise Therapy in Treatment of Patients With Patellofemoral Pain Syndrome: Systematic Review and Meta-Analysis.” The authors have brought to our attention that 2 randomized trials^2,3 were inadvertently omitted during the writing of their paper. They included a total of 15 studies and 746 participants in their review. In January 2015, the Cochrane Database of Systematic Reviews published a systematic review by van der Heijden and colleagues,⁴ “Exercise for Treating Patellofemoral Pain Syndrome,” which included 31 randomized trials and 1,690 participants. Although the results of this more comprehensive systematic review corroborated the results of the flawed Clijsen et al review, the editors want to raise readers' awareness.

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