Femoral head necrosis mostly occurs in young patients around 30-50, some patients are found to be ARCo3, 4 stage, some patients with femoral head necrosis area accounting for more than 60% of the femoral head, and the depth of the femoral head diameter and neck junction, not suitable for head preservation treatment and hip surface replacement, traditional hip replacement there are concerns about the service life. At present, metal-to-metal total hip replacement provides a better choice for such patients. Firstly, the improvement of metal-to-metal process can reduce the wear and tear a lot, and secondly, the larger femoral head increases the stability of the hip joint, which can be almost to make patients do any movement without the risk of dislocation and adapt to the life needs of patients under 55 years old. Of course, women in their reproductive years and patients with renal insufficiency are not suitable for metal-to-metal total hip replacements.