COMPARATIVE STUDY OF RECRUITMENT INTERVAL (RI) ON VASTUS MEDIALS IN NORMA SUBNECT AND PATIENTS WITH PATELLOFERMORAL PAIN SYNDROM IN PRE AND POST EXERCISE CONDITION

One of the most important causes of patellofemoral pain syndrome is malfunction of quadriceps muscle, specially vastus medialis muscle weakness. Twenty seven normal healthy subjects (21.4±3.4 years) and 17 patients with patellofemoral pain (24.1±3.6 years) were included in this study. Recruitment Internal of the patients and normal subjects were recorded by using a coaxial needle electrode in vastus medialis during voluntary contraction. The effects of ten sessions of closed chain quadriceps exercise were evaluated on the control group and patients by methods of RI recording. Following exercise program there was significant decrease of mean value of RI in Vastus medialis muscle (P<0.0001). RI recording method could be used for assessing the weakness of Vastus medialis muscle.