Most knee ligament tears are caused by direct or indirect external forces to the knee joint. When a patient has a knee ligament tear, the patient will clinically feel swelling and pain in the knee area, subcutaneous bruising, and limited functional movement of the knee joint. For example, if a partial tear of the anterior and posterior cruciate ligaments of the knee occurs, the patient may be treated conservatively. The patient can be instructed to brake the knee joint, and at the same time, the injured area should also be externally applied ointment to activate blood stasis, reduce swelling and pain, or Chinese medicine fumigation; at the same time, the patient can also be instructed to take oral bruising medicine, which can make the injured ligament tissue recover as soon as possible. If the anterior and posterior cruciate ligaments of the knee joint are completely ruptured and the stability of the knee joint is damaged, surgical treatment is required, and minimally invasive surgery can be performed through arthroscopy to repair the anterior and posterior cruciate ligaments.