Arthroscopic surgery has revolutionized the diagnosis and treatment of intra-articular diseases with the advantages of less trauma, fewer complications, and faster recovery. Some people call arthroscopic surgery, along with internal fixation of fractures and artificial joint replacement, the three most important advances in the field of orthopedics in the 20th century. The risks of arthroscopic surgery are as follows: 1) there may be fluid and blood accumulation in the joint after surgery, which can be treated by pressure bandaging, joint puncture and fluid extraction, and if there is repeated joint fluid accumulation, it can be treated with small doses of steroid injection; 2) tissue edema occurs, which does not require special treatment and usually subsides on its own within 1-3 days; 3) it leads to knee joint ankylosis, which is mostly seen in patients wearing knee braces after meniscal suture surgery After the meniscus suture, the knee joint stiffness is caused by the failure to exercise the joint in time, so contact with the doctor in charge and the rehabilitator for timely functional exercise; 4. Diabetic patients should control their blood sugar within the ideal range, and malnourished patients should strengthen their nutrition and improve their body resistance. Postoperative infection should be antibiotic anti-infection, if antibiotic treatment is ineffective, joint lavage and drainage is feasible.