Isokinetic evaluation of quadriceps strength in open and closed kinetic chains in patients with anterior cruciate ligament reconstruction

Strength of knee extension and squat were compared between anterior cruciate ligament reconstructed [ACLR] patients and healthy subjects. 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. Concentric and eccentric knee extension strength of the involved leg was decreased but squat strength showed no difference. 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