There are many types and designs of artificial total hip joints, which basically consist of three parts: a metal acetabulum, a metal prosthetic stem, and a femoral head. The metal acetabulum part is fixed by bone cement, or by the combination of bone and the outer surface coating of the acetabular cup to obtain long-term fixation. The prosthetic stem is inserted into the femoral medullary cavity, and is also fixed by bone cement, or by the combination of bone and the outer coating of the prosthetic stem to achieve fixation. The femoral head is formed by matching the lining of the metal acetabular cup to form a new joint. The femoral head is mostly made of metal or alloy, and the commonly known ceramic is also an alloy, which is known as “ceramic head” because of its ceramic-like appearance. The lining of the acetabular cup can be polyethylene or an alloy. The low coefficient of friction of the new joint surface produces good wear resistance.