This document discusses anterior cruciate ligament (ACL) injuries. It provides information on the anatomy of the ACL, mechanisms of injury, clinical presentation, imaging, and various treatment options. ACL tears most commonly occur during non-contact pivoting injuries and are more prevalent in female athletes. Imaging like MRI can show discontinuity of ACL fibers. Treatment may involve physical therapy, ACL reconstruction using autografts like patellar tendon or hamstring tendons, or allograft for revisions.