The total hip joint consists of an artificial acetabulum and an artificial femoral head. In the past, both of them were made of metal, and they are not used now because of the many complications in practice. At present, both domestic and foreign countries use the acetabulum made of ultra-high polymer polyethylene and the artificial femoral head made of low strength modulus metal. There are more types and designs of artificial total hip joints, mainly the diameter of the femoral head and the design of the acetabular surface with bone fixation. A thicker acetabulum with a relatively small diameter artificial femoral head makes up a total hip with less cephalic socket friction, a stable artificial socket, and less local reaction. The complications of total hip arthroplasty include, in addition to the complications of artificial femoral head replacement, loosening of the artificial acetabulum, dislocation and local reactions caused by the wear of the UHPC surface in the weight-bearing area. The preoperative time of total hip replacement surgery is usually 2 to 3 days, and the postoperative hospital stay is usually 5 to 7 days, so the hospital stay is usually about 10 days. However, the hospital stay is longer for some patients with more comorbidities or postoperative complications.