Many patients (stage 3-4 femoral head necrosis, acetabular dysplasia, ankylosing spondylitis combined with hip ankylosis, rheumatoid arthritis, non-healing femoral neck fracture, femoral neck fracture patients older than 55 years old) face their hip disorders and often encounter the question and confusion: when is the right time to replace the joint? They want to have surgery, but they are afraid that it will not last long enough. The main reason for this concern is that there are some problems with the joint replacement many years ago, mainly because there are few professional joint surgeons and many surgeries are done by non-professional surgeons, and the chance of problems in this case is great. Another problem is the friction interface of the joint and the bone-prosthesis interface. The friction interface was used years ago as a metal-polyethylene interface, and the annual wear is about 0.1mm, and the service life of the joint is mostly about 15 years. Poor process treatment of the bone-prosthesis interface leads to difficulties in bone growing in or bone growing on, which can easily lead to loosening of the prosthesis. In recent years, especially in the past 10 years, with the increasing specialization of the division of labor (mainly in tertiary hospitals), many of the joint professional senior title of the doctor more and more, most of them have specialized training, technical first provided a guarantee. In addition, with the development of material science, the performance of the bone-prosthesis interface and the friction interface have been greatly improved and enhanced compared to the previous prosthesis (artificial joint), as long as the technology is in place, the bone of the prosthesis has become easier to grow into, while the key is the friction interface has been greatly improved, the application of high cross-linked polyethylene, the emergence of the fourth generation of ceramics, have made the wear resistance of the joint has been revolutionized. The application of highly cross-linked polyethylene and the emergence of fourth-generation ceramics have revolutionized the wear resistance of the joints, with wear even lower than 0.01 mm/year. With the technical assurance and the application of wear-resistant friction interfaces, the concern of many patients that the prosthesis will not last 10-15 years has become a thing of the past, and they can choose surgery with confidence when there are clear indications for joint replacement. (The author’s own experience is summarized for reference only)