IRCT201010305050N1 IRCT 2011-04-14 Vice chancellor for research, Tehran University of Medical Sciences Treatment of anterior knee pain according to risk factor correction Comparing two treatments of pattelofemoral pain syndrome, routin approch and based on risk factors according to pain and function, among patients visited in sport medicine 2011-04-21 anticipated 60 Complete https://irct.ir/trial/5386 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment. N/A Patellofemoral pain syndrome. Intervention 1: group A: regardless of risk factors, routin treatment that includes perscription of narcotic drugs and quadriceps isometric exercise is done 3 times per day with 8 repitition each time holding for 10-15 soconds and straight leg rising 3 times per day with 8 repitition for 3 months. Intervention 2: group B: In addition to treatments in group A, receive treatment and correction of found risk factors in physical exam including: 1-appropriate shoes and insoles for pess planus or pess cavus 2-heel lift for leg lenth discrepancy 3-taping and strengthen of vastus mediallis obliqus muscle for patellar malalignment 4-illiotibial band stretching for illiotibial band tightness 5-stretching of hamstring muscles for hamstring tightness 6-stretching of gastrocnemious muscle for gastrocnemious tightness 7-hip extension exercise for illiopsoas tightness 8- treament of patellar hypermobility with taping, brace and strenghting exercise of patellar stabillator muscles.