Background: Anterior Cruciate Ligament (ACL) is one of the main knee stabilizing ligaments. Because of high incidence of ACL tearing especially in young athletes its reconstruction is very important. The aim of this study was to evaluate short-term results of anterior cruciate ligament ruptures using four strand hamstring auto graft and Bone patellar tendon autograph.

Methods: The study group included 96 patients (3 female and 93 male) with ACL teared who had been referred to our center in 5 years period (2002-2007). The subject which were Accessed in this study included meniscal injury concomitant chondral injury, determine the most common cause of ACL tearing, comparision of IKDC and lysholm score in all patients before and after surgery, and limitation of rang of motion of knee post operation.

Results: Involvement was in the right knee in 38 patients and in the left knee in 58 patients. Mean age of patients was 27.6 years (19-48). Mean surgical delay was 18 month (1-77). The most common cause of tear was playing soccer. Meniscal injury was in 78 patients. (Medial meniscus in 63 patients, lateral meniscus in 29 patients) Concommitent chondral injury was in 54 patients (56.25%). 68% of patients returned to preoperative functions sport activity. There was no limitation in extension and there was 6 patients limitation in flexion about 20º. In last visit of patients IKDS in class A and B was 96.

Conclusion: It is seem that arthroscopic reconstruction of ACL is a safe and good method in treatment of Knee stability. Use of IKDC and lysholm score for comparision of patients before and after surgery is helpful. The operation should be done early after injury. Reconstruction of ACL in older patients in the abscense of DJD is effective.