What is artificial joint replacement? Artificial total hip replacement is the replacement of the original biological femoral head and acetabulum with a metal artificial femoral head, metal acetabular cup, polymerized polyethylene, or metal true socket to mechanically restore joint motion and mechanical conduction. Artificial knee surface replacement is the application of metal femoral condyles and, polymer polyethylene knee liner, metal tibial plateau seat to replace the biological knee femoral condyles and tibial plateau. Which patients need artificial hip or knee replacement surgery: for those who are over 55 years old, suffering from severe knee and hip osteoarthritis, rheumatoid arthritis, hemophilic arthritis, femoral head necrosis, femoral neck fracture, congenital joint dysplasia, joint trauma and joint infections sequelae and artificial hip, knee replacement after prosthetic fracture, loosening the need to carry out the revision of the patient, can be considered. This type of surgery. After joint replacement surgery, the patient can get an instantly usable joint, reduce complications such as bed sores and pneumonia, prolong the patient’s life, reduce pain and improve the quality of life and activities of the patient. Why is artificial hip replacement preferred for subtalar and significantly displaced fractures of the femoral neck in the elderly? Femoral neck fracture is quite common, accounting for about 3% of the total body fracture, mostly seen in the elderly over 60 years old, the patient is old and weak, and may suffer from high blood pressure, heart disease, diabetes, etc., and after the fracture of the bed for a long period of time, it is easy to cause some life-threatening comorbidities, such as pneumonia, vascular embolism, heart failure, cerebral vascular accidents, mental disorders, urinary tract infections, decubitus ulcers, etc. The previous treatment only focuses on bed rest. In the past, the treatment was only based on bed rest, and the patients often died of the above complications. Later on, internal fixation techniques were gradually used, which further improved the fracture healing rate and bed rest problem, but there are still some fractures that are difficult to be healed. Or even if the fracture has healed, especially for those with femoral neck fracture head-down type and those with obvious displacement, the incidence of femoral head necrosis and even collapse is very high. Hip function is only about 50% of the patients can get satisfactory results, and some patients have traumatic arthritis, so for obvious displacement or head-down type fracture, conservative treatment and other surgical treatment are difficult to heal, and the femoral head is very prone to necrosis, it is better to carry out artificial hip arthroplasty. This not only solves a series of problems brought about by long-term bed rest, but also does not have the problem of necrosis of the femoral head, the bone does not heal, and the patient’s hip function recovers well, so for this type of fracture should choose artificial femoral hip replacement, the physical condition of the patient is poorer, consider the simple femoral head replacement.