Arthroscopic removal of free body synovectomy 2 months after the inner side of the knee joint pain may be due to postoperative incomplete recovery, osteoarthritis and thigh muscle atrophy and other reasons. 1. After arthroscopic surgery around the ligament muscles and other soft tissue recovery takes about 3 months, 2 months after the operation there is a knee joint medial damage has not been fully repaired, can be under the guidance of the doctor oral analgesic drugs such as diclofenac sodium, celecoxib, etc., and at the same time pay attention to rest, to avoid weight-bearing. 2. It may also be caused by osteoarthritis. Due to degenerative joints, osteophytes and other joint pain, oral analgesic drugs such as diclofenac sodium, celecoxib, etc. can be taken under the guidance of the doctor, it is recommended to further consult a doctor for examination and treatment under the guidance of the doctor, and in severe cases, surgical replacement of the knee joint is required. 3. Thigh muscle atrophy: many patients with knee joint free body have the complication of thigh muscle atrophy. Arthroscopic removal of free body synovectomy two months after the thigh muscles have not recovered, but also need to carry out rehabilitation training and functional exercise. Because of thigh muscle atrophy can lead to pain on the inside of the knee joint. If there is still pain two months after the operation, patients are advised to visit the orthopedic department in time, introduce their condition to the doctor in detail, further improve the examination, and actively treat the condition so as not to aggravate it.