Hi, this is Dr Hitin Mathur, Orthopaedic surgeon at Fortis c-doc Hospital, New Delhi Welcome to Practo. A c l is an integral part of the knee and helps in stabilizing the knee, especially while doing high end sports activities. If you have been diagnosed with an a c l injury and you want to continue playing Sports an ACL repair is imperative. The surgery involves taking your hamstring muscles and implanting it in the region of the ACL. Not getting the ACL repaired would lead to damage to the articular cartilage of the knee which would be a permanent damage. Thus, I would advise you to get the surgery done the soon as possible.