The purpose of surgery is, firstly, to relieve pain and, secondly, to improve the stability and mobility of the knee joint. According to the patient’s condition, age, occupation, weight, and mental status, the indications for surgery are determined 1.In principle, elderly people over 55 years old with severe bone destruction on knee X-ray, significant pain, standing or walking dysfunction due to deformity and/or twinning and instability of the joint; 2.Primary osteoarthrosis, rheumatoid arthritis, traumatic arthritis and some other non-septic 3, male osteoarthritis patients aged 40 to 60 years, if they must engage in physical labor, suitable for osteotomy or joint fusion. Patients of the same age with rheumatoid arthritis who have impaired mobility due to pain and deformity are also surgical indications for artificial knee replacement in order to improve quality of life; 4. Bone tumors of the distal femur or proximal tibia, who are in a position to preserve the limb.