1. In principle, elderly people over 60 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 are surgical indications for artificial knee arthroplasty; 2. The purpose of surgery is, firstly, to relieve pain and, secondly, to improve the stability and mobility of the knee joint. The indications for surgery are determined according to the patient’s condition, age, occupation, weight, and mental status; 3. Primary osteoarthritis, rheumatoid arthritis, traumatic arthritis, and some other non-septic arthropathies in their later stages; 4. Male osteoarthritis patients aged 40 to 60 years are suitable for osteotomy or joint fusion if they must engage in physical labor. Patients of the same age with rheumatoid arthritis, who have impaired mobility due to pain and deformity, are also surgical indications for artificial knee arthroplasty in order to improve their quality of life; 5. Bone tumors of the distal femur or proximal tibia, who are in a position to preserve their limbs, can have artificial knee arthroplasty with a special prosthesis after resection of the tumor segment.