Popliteal cyst, osteoarthritis, posterior meniscus angle injury, etc., commonly used drugs, physical therapy and surgery. 1. Popliteal cyst: It is mostly seen in degenerative changes of the knee joint, resulting in knee joint effusion, which triggers popliteal cyst, which can be treated by professional doctor’s puncture and fluid extraction, local injection of tretinoin and pressure bandage, and surgical resection of the cyst if necessary. 2. Osteoarthritis: it can be caused by cold, chronic strain, etc. It can be relieved by taking oral medication such as glucosamine hydrochloride and diclofenac sodium as prescribed by the doctor, in addition to paying attention to rest, avoiding strenuous exercise, and can be combined with infrared and other physical therapy. 3. Posterior meniscus angle injury: it is mostly seen in meniscus injury caused by external force, which leads to the symptoms mentioned above, in addition to rest, braking and other general treatments for mild cases, plaster or brace can be taken for external fixation treatment, and surgery is needed for serious cases. In addition, it can also be seen in the posterior cruciate ligament injury, popliteal strain and other causes of the above symptoms, it is recommended to go to the hospital in a timely manner to avoid delays in the condition.