Patellofemoral pain syndrome (PFPS) is often treated conservatively with voluntary exercise for the Quadriceps Femoris. Nevertheless, a substantial percentage of patients remain symptomatic. Although exercise seems a crucial element for treatment, it may serve to increase patellar irritation with the resulting dilemma that patients exercising the muscles may be simultaneously irritating the knee. Patients with Patellofemoral pain sundrome( PFPS) have been using quadriceps strengthening exercises with varying results on muscle strength and pain. However, there are various problems associated with these forms of traditional quadriceps strengthening exercises.