Asymmetry in the repaired knee is a possibility and has been found to have a large effect between limbs for peak vertical ground reaction force, peak knee-extension moment, and loading rate during double-limb landings, as well as mean knee-extension moment and knee energy absorption during both double- and single-limb landings. Analysis of joint symmetry along with movement patterns should be a part of return to sports criteria. Rehabilitation
The goals of rehabilitation following an ACL injury are to regain knee strength and motion. If an individual with an ACL injury undergoes surgery, the rehabilitation process will first focus on slowly increasing the range of motion of the joint, then on strengthening the surrounding muscles to protect the new ligament and stabilize the knee. Finally, functional training specific to the activities required for certain sports is begun. It may take six or more months before an athlete can return to sport after surgery, as it is vital to regain a sense of balance and control over the knee in order to prevent a second injury. Prognosis
The prognosis of ACL injury is generally good, with many people regaining function of the injured leg within months. ACL injury used to be a career-ending injury for competitive athletes; however, in recent years ACL reconstruction surgery followed by physical therapy has allowed many athletes to return to their pre-injury level of performance.Long term complications of ACL injury include early onset arthritis of the knee and/or re-tearing the ligament.
There is evidence that engaging in neuromuscular training (NMT), which focus on hamstring strengthening, balance, and overall stability to reduce risk of injury by enhancing movement patterns during high risk movements. Such programs are beneficial for all athletes, particularly adolescent female athletes.Injury prevention programs (IPPs), are reliable in reducing the risk factors of ACL inquiries, referring to dominance theories. The ligament dominance theory reduced peak knee abduction moment but should be more focused on prioritizing individualized, task-specific exercises focusing on an athletes risk profile. It is more beneficial than a generic program. There is an increase in hip and knee flexion angles, such as plyometrics and jump-landing tasks, which reduces the risk of quadriceps dominance. However, there were no changes found for peak vGRF, which measures for "softer" landings. Unfortunately, there was no conclusive data on how IPPs reduces the risk associated with leg dominance theory. Treatment
Treatment for ACL tears is important to:
Reduce abnormal knee movements and improve knee function
Build trust and confidence to use the knee normally again
Prevent further injury to the knee and reduce the risk of osteoarthritis
Optimise long-term quality of life following the injury

Nonsurgical
Nonsurgical treatment for ACL rupture involves progressive, structured rehabilitation that aims to restore muscle strength, dynamic knee control and psychological confidence. For some, the ACL may heal without surgery during the rehabilitation process (i.e. the torn pieces re-unite to form a functional ligament).The purpose of exercise treatment is to restore the normal functioning of the muscular and balance system around the knee.