How long it takes for a knee ligament injury to return to normal depends on the extent of the ligament injury and the location of the injury, so it is impossible to make a generalization. If it is a mild ligament injury, it can be treated conservatively with rest and recuperation for about 2-3 weeks. If it is a degree I or II medial collateral ligament injury, it can gradually return to normal after wearing a brace and other treatments for about 6 weeks. In the case of degree III injury, surgical repair is required, and it will return to normal in about 2-3 months. In the case of ACL injury, after reconstructive or repair surgery, a brace is required and will gradually return to normal in about 3 months. After recovering from a knee ligament injury, patients should try to avoid too strenuous and difficult movements, in addition to strengthening muscle exercises to reduce the load on the ligament during exercise, which will help reduce the chance of ligament damage.