The anterior cruciate ligament (ACL) injuries are common knee injuries especially in people younger than 30 years of age and those who are physically active. These injuries are mostly seen with high incidence rates in adolescents playing pivoting sport activities such as football and basketball. Because of their larger pelvic diameters, young women have a 35 times higher risk of ACL injury than men in pivoting sports (1-3). The goals of ACL reconstruction are to regain stability and unrestricted function as well as to protect joint health in the long term. Current treatments for ACL injury are moderately successful and most individuals are able to return to their preinjury level of sports activity (4, 5). But after beginning recreational activities, ACL rerupture is the most common problem and, for this reason, it requires further analysis so as to decide the best option for ACL reconstruction injury methods and appropriate graft choices.A 25 years-old man with knee instability was referred to our orthopaedic clinic. He was a football player and had an injury history about one month ago with forced rotation in his right knee. In physical examination, he had moderate pain and suprapatellar effusion. His McMurray, varus-valgus, and posterior drawer tests were negative. But he had positive anterior drawer and lachmann tests. The Lysholm knee score was 64 while his Cincinati score was 52. The Tegner score was 3,6. Magnetic resonance imaging (MRI) showed ACL rupture in the right knee with no accompanying injuries. We performed an arthroscopical anatomic single bundle ACL reconstruction by using the autogen quadriceps tendon. No accompanying injuries were detected during arthroscopic surgery. After the surgery, we used a knee brace with an angle-adjustable hinge for 4 weeks. Within 2-14 postoperative days, we obtained full extension, minimized swelling, active quadriceps control, and 90 degrees of flexion. Within 2-6 weeks, we increased flexion to 135 degrees. We obtained full range of motion within 6-9 weeks in addition to increased functional activities, improved muscle strength, and endurance within 9-12 weeks. After 12 weeks, we asked the patient to start light sport activities. 6 months after the surgery, the patient resumed pivoting activities. At the end of 6 months, the Lysholm knee score was 86, Cincinati score was 78, and Tegner score was 5.8. The graft was intact on MRI and the femoral tunnel enlargement was 0.68 mm.