The anterior cruciate ligament is an important structure that maintains the stability of the knee joint. After an injury, it may have little effect on the patient’s daily walking function, but it can have a significant impact on sports function. After an ACL injury, except for a few people who can continue to play sports, most people are unable to run, jump, stop, or participate in basketball, badminton, soccer, or other sports. In fact, patients who are able to exercise do so at the expense of damaging the cartilage and meniscus of the knee joint. Anterior cruciate ligament reconstruction is required to restore athletic ability and level of performance and to prevent premature joint degeneration and the development of knee osteoarthritis.