The time for the ACL tear to heal on its own is related to the degree of the tear and the physical quality of the patient, so it cannot be generalized. If the anterior cruciate ligament is partially torn and the joint stability is still good, the torn injury should be promptly rested in bed, local braking should be given, and at the same time, topical ointment for blood circulation and blood stasis should be applied, usually the ligament can be repaired by itself in 6 weeks. If the tear is more severe, the two ends of the anterior cruciate ligament are separated and usually cannot be healed, the two ends of the cruciate ligament will only contract and shrink farther and farther, and cannot be closed, so surgery is needed. Therefore, if a patient is suspected of having an ACL tear, he or she should be seen by an orthopedic surgeon who can guide him or her in the next step of treatment.