Patellofemoral pain syndrome is a common overuse disorder,which is traditionally addressed by knee st rengthening exercises and stretching. Some have suggested that strengthening of the hip musculature may also be important when addressing this condition. This study assessed whether a hipstrengthening program,in addition to a onventional knee exercise program,an improve the outcomes of these patients.Fifty- four sedentary women with unilateral patellofemoral pain syndrome were randomly assigned to either a knee exercise group(KE) or a knee and hip exercise group(KHE).The knee extension exercises were completed at 70%of the estimated one repetition