Hip replacement surgery patients need to do replacement only in the following cases: 1, elderly femoral neck fracture, femoral neck fracture is divided into subcapitate, transcapitate and basal type. Generally, subcapital and transcervical fractures need hip replacement surgery; 2, patients with femoral head necrosis, such as long-term use of hormones, long-term alcohol consumption can lead to femoral head necrosis, causing claudication, walking difficulties, the need to do hip replacement; 3, patients with hip dysplasia, that is, congenital hip dysplasia, the formation of osteoarthritis in later life, generally need to do the operation; 4, traumatic arthritis, the hip joint is subjected to trauma, such as the hip joint, the hip joint is not a good place for the hip to grow. Hip joint trauma, such as acetabular fracture caused by hip arthritis, need to do hip replacement surgery; 5, special diseases, such as Charcot’s arthritis, hip tuberculosis caused by joint ankylosis, and ankylosing spondylitis caused by hip ankylosis, also need to do hip replacement surgery.