The ideal total hip replacement lasts 20-30 years and total knee replacement 15+ years. The advent of new materials that reduce joint wear will result in a longer service life than expected. We agree that the main factors affecting the life of an artificial joint are the surgical technique of the operator, the material of the joint prosthesis, and the rehabilitation and protection of the patient after surgery. The surgical technique is the core of about 60% of the success of the artificial joint, joint prosthesis materials account for 30%, the patient’s physical condition, post-operative rehabilitation and protection accounted for about 10%. 1, the quality of artificial joint prosthesis human joints are generally movable joints, especially the hip and knee joint activity, which is relatively high requirements for wear-resistant prosthetic materials, high wear resistance, less wear is a common expression to extend the life of artificial joints. Because the prosthesis is placed in the human body, the stability of the material, biocompatibility, mechanical strength, the impact on the skeletal muscle vascular nerve, etc. should strive to meet the human physiopathology. Currently, the commonly used artificial joint materials are mainly metal alloys, polymer materials, ceramic materials and so on. Metal alloys are mainly 316L stainless steel, titanium alloy, cobalt-chromium-molybdenum alloy and cobalt-nickel alloy; polymer materials are ultra-high polymer high-density polyethylene; ceramic materials are mainly aluminum oxide, zinc oxide, titanium oxide, hydroxyapatite and tricalcium phosphate. These three materials have been clinically proven and are widely used in clinical practice. The use of artificial joint materials made of artificial joints is artificial joint prosthesis, although the material is currently used in the above three, but artificial joint prosthesis due to the origin, manufacturers, domestic, imports, joint ventures and other differences in the quality of artificial joint prosthesis there is a great disparity. Then how to choose a suitable cost-effective prosthesis according to their individual situation to extend the life of the artificial joint prosthesis? (1) Fully understand the indications and contraindications for joint replacement. If an inter-rotor fracture is replaced, the efficacy of choosing a good artificial joint prosthesis is not optimistic. (2) Bone condition and age characteristics of the patient. Bone quality: the bone is hard, thick cortex, we generally choose biological type prosthesis, that is, the prosthesis can grow with the bone, both to ensure the initial stability, its long-term stability is also very good. If the osteoporosis is heavy, the medullary cavity is wide and the cortex is thin, we tend to use bone cement type prosthesis. Age: For younger age, we mostly use biologic type prosthesis with low wear rate to increase the service life of the joint as much as possible. Older patients can choose moderately priced and durable artificial prostheses according to the patient’s financial ability and usual health condition. (3) According to the patient’s economic conditions to choose artificial joint prosthesis. Relatively speaking, the price of domestic artificial joint prosthesis is low, the price of joint venture artificial joint prosthesis is medium, and the price of imported artificial joint prosthesis is high. For patients hospitalized in our department, each patient takes personalized guidance and detailed plan to choose the cost-effective artificial joint prosthesis suitable for the patient. 2, the surgical operator’s technique The surgeon’s surgical technique is the key to the success of the artificial joint replacement, and also the key to the longevity of the artificial joint. There are specialties in the field of surgery, and a professional joint team can be focused, professional and dedicated. A professional medical team can have a deeper understanding of the surgical approach to artificial joints, the anatomical characteristics of the human body, the position angle of the joint, the biomechanics of the joint, the advantages and disadvantages of the prosthetic material, and the extent of the patient’s disease. A professional team has an advantage in terms of surgical volume, operative time, and postoperative management. There will be a big difference between a surgeon with 10 surgeries per year and a surgeon with 1000 surgeries per year. There is also a big difference in surgical procedures between a hospital with 10 surgeries per year and a hospital with 1,000 surgeries per year. In the United States, a study of the impact of patient, hospital, and procedure volume on the time spent on hip and knee replacement surgery found that there are many clinical benefits to reducing the time spent on surgery, including a reduced risk of various arthroplasty complications such as death, infection, venous thromboembolism, and postoperative neurological deficits. For the hip joint, the issue of firmness and angulation of the acetabulum and femoral stalk is central to the technique, which requires good R-matching, good grasp of the anterior tilt angle of the stalk, good soft tissue balancing of the hip joint, etc. Knee replacement is relatively difficult, requiring the surgeon to accurately grasp the angle of the knee joint, the force line, meticulous cementation techniques, and most difficult of all, the soft tissue balance of the knee joint, even the suturing of the knee joint and drainage issues are very important. Choosing a skilled surgeon and a good hospital is the most critical factor to prolong the life of the artificial joint. 3. Post-operative rehabilitation and joint maintenance Although the artificial joint replacement replaces the diseased joint and restores the patient’s quality of life, it is important for the patient to rehabilitate and protect the artificial prosthesis in order to prevent dislocation of the prosthesis and to establish long-term stability and extend its service life. The prosthesis is fixed by the bone, loose bone is not conducive to the fixation of the prosthesis, the support force is also weak, long-term will occur the loosening and subsidence of the prosthesis, so we must prevent osteoporosis from diet, drugs and exercise to extend the life of the prosthesis, for hip replacement patients, is strictly prohibited to bend the hip more than 90 °, prohibited to sit on a low stool, less than 45cm or too soft chair, seat, keep the two knees apart 15 When seating, keep the knees apart by 15 -45 cm, minimize or avoid complete squatting, less weight bearing, no “stilts”, no strenuous movements, and modify some of the furniture at home to facilitate the above requirements. For patients with knee replacements, avoid kneeling, extensive knee rotation, and lateral pressure.