Anterior cruciate ligament (ACL) reconstruction is a surgery that repairs a tear in the ACL, a major ligament of the knee that won’t heal on its own. ACL reconstruction surgery may help an athlete return to the field after an injury, but many people with torn ACLs are able to continue life as usual without the procedure. Reconstruction involves creating a new ligament from tissue grafts. Tearing the ACL ligament is one of the most common knee injuries. Sports and fitness routines that involve running, pivoting, turning and jumping are common causes of torn ACLs. Since the ACL is one of the main stabilizing ligaments in the knee, it’s important to protect your knees as much as possible during sporting and fitness activities.