PT - JOURNAL ARTICLE AU - David T Felson TI - Challenges of identifying and treating patellofemoral osteoarthritis AID - 10.1136/bjsports-2016-096294 DP - 2016 Jul 01 TA - British Journal of Sports Medicine PG - 832--833 VI - 50 IP - 14 4099 - http://bjsm.bmj.com/content/50/14/832.short 4100 - http://bjsm.bmj.com/content/50/14/832.full SO - Br J Sports Med2016 Jul 01; 50