When the knee ligament rupture later, the treatment method needs to be surgical, conservative treatment according to the situation, as follows: i. Clarify the severity of ligament injury: determine the corresponding treatment plan, need to carry out lateral stress test, drawer test, need to carry out MRI of the knee joint, can clarify the severity of ligament injury. Second, surgical treatment: The examination shows that the ligament is completely ruptured and the joint stability is very poor, it is necessary to actively carry out surgical treatment and the ligament needs to be repaired and reconstructed. After surgery, it is necessary to strictly carry out brace protection brake, and actively change the wound, disinfection, prevent infection, and apply anticoagulant drugs to prevent blood clots. Conservative treatment: If the ligament damage is relatively light and the joint stability is very good, you can choose conservative treatment. It is necessary to carry out strict external fixation protection for about one month, remove the external fixation, and carry out functional exercises of joint flexion and extension.