25% of the anterior cruciate ligament (ACL) injuries are estimated as partial injuries. According to the anatomical and biomechanical studies, ACL is divided as anteromedial (AM) bundle and posterolateral (PL) bundle functionally. The definition, diagnosis and natural course of partial ACL injuries are still controversial. In the literature, partial injury of ACL was described with different definitions like more than 50% intact ACL, the loss of continuity of ACL in magnetic resonance imaging, the loos of contact to the femoral footprint of AM or PL bundles in arthroscopic assessment. In some of these patients who has obscure clinical instability findings and low functional demands, there are good results with conservative treatment. However, according to studies regarding the natural course of the disease in young and active patients, the partial ACL rupture can be advanced to total rupture nearly in 50% of the patients. For this reason, in high demanding patients or patients who had additional intraarticular pathologies, the surgical treatment of partial ACL rupture will be more sensible. In the surgical treatment; thermal modification, single bundle repair, selective single bundle reconstruction and total anatomic ACL reconstruction have been described. In the literature for the choice of treatment, it is recommended that each patient should be evaluated individually. In the surgical treatment, a selective single bundle reconstruction or total anatomic ACL reconstruction can be performed according to the partially injured site and surgeon`s preference.