With ACL reconstruction, if the patient recovers well, he or she can walk normally as early as 6 weeks after surgery, and the patient can resume normal work and life. A ruptured or torn ACL can affect the stability of the knee joint, especially during squatting activities, which can easily cause the femur to shift forward, resulting in a weakened knee joint stability. Postoperative bed rest, brace immobilization, quadriceps functional exercises, and knee extension and flexion activities are required. If the patient actively cooperates with the treatment and diligently performs functional exercises, he or she can generally resume normal activities after 6 weeks and can go to work, but complete local recovery takes about 3 months. In addition, if the patient performs functional exercises of the joint early, in more difficult cases, he or she can use the physiotherapy means of the rehabilitation physiotherapy department to help recovery.