Isokinetic Evaluation of Quadriceps Strength in Open and Closed Kinetic Chains in Patients with Anterior Cruciate Ligament Reconstruction

Background: strength of knee extension and squat were compared between anterior cruciate ligament reconstructed (aclr) patients and healthy subjects.materials and methods: twenty aclr and twenty control subjects were participated in this non-exprimental study. isokinetic peak strength of knee extension and squat in involved and uninvolved side of the aclr patient and control group were measured.results: concentric and eccentric knee extension strength of the involved leg was decreased but squat strength showed no difference.conclusion: in spite of return to sport activity and normal squat strength weakness of knee extensor muscles in the involved side of the aclr patient was existed.