Knee arthroscopy and exercise versus exercise only for chronic patellofemoral pain syndrome: a randomized controlled trial

Jyrki A Kettunen¹ , Arsi Harilainen² , Jerker Sandelin² , Dietrich Schlenzka² , Kalevi Hietaniemi³ , Seppo Seitsalo² , Antti Malmivaara⁴ and Urho M Kujala⁵

¹The ORTON Research Institute, Invalid Foundation, Tenholantie 10, FIN-00280 Helsinki, Finland

²The ORTON Orthopaedic Hospital, Invalid Foundation, Tenholantie 10 FIN-00280 Helsinki, Finland

³The Helsinki University Central Hospital, Jorvi Hospital, Turuntie 150, FIN-02740 Espoo, Finland

⁴The Finnish Office for Health Care Technology Assessment/National Research and Development Centre for Welfare and Health, Lintulahdenkuja 4, FIN-00530 Helsinki, Finland

⁵The Department of Health Sciences, University of Jyväskylä, P.O. Box 35, FIN-40014 University of Jyväskylä, Finland