The best time to operate on a ruptured ligament is within 1 week after the injury. After the ligament rupture, there will be obvious local swelling, if early surgery, it will affect the local wound healing, because surgery is also a kind of trauma, and the swelling is more obvious within 48 hours and will become more and more serious. If surgery is performed at this time, it is difficult to close the incised wound, and local skin blisters will appear, and necrosis may also occur in serious cases, so generally choose to do conservative treatment first, elevate the lower limbs, local ice, intravenous drip dehydration and swelling medication, the best time for surgery is after the swelling gradually decreases. The surgery time is not recommended too long, too long local will have granulation tissue growth, scar adhesions after surgery is relatively difficult, so it is recommended to do surgery in about 1 week is most suitable. After surgery, it is necessary to keep the wound dry and insist on changing medicine to avoid wound infection and help the repair of ligaments.