The weight of the upper body is supported by the two legs, and the two hip joints are the most important support points. The spherical physiological structure of the femoral head is perfectly suited to this function of weight bearing. The surface of the joint is usually lined with a thin layer of smooth cartilage, which reduces the friction of the joint. If the femoral head collapses due to disease (most often due to ischemic necrosis of the femoral head), or due to various arthritic conditions, the cartilage wears and peels off, resulting in joint instability, bone spurs, and bones rubbing against each other. The bad femoral head and a part of its base (femoral neck) are removed and an artificial joint made of metal, polyethylene and ceramic light is inserted, thus restoring the hip joint to its perfect dome, improving joint mobility and reducing joint pain. Pre-operative x-ray of a patient with bilateral aseptic necrosis of the femoral head, post-operative x-ray of bilateral ceramic total hip replacement, bilateral acetabular deformation, femoral head collapse, center of rotation, showing that the damaged joint has been replaced by the artificial joint, limb shortening, joint gap disappearance, bilateral joint symmetry, limb equilibrium, and correct placement of the prosthesis The artificial hip replacement surgery is the greatest medical achievement of the 20th century. The first artificial hip replacement surgery occurred around the 1960s, and with the continuous improvement of surgical techniques and biomaterials, the surgical results have become better and better, and now artificial hip replacement has become a very mature treatment for severe hip pathologies. Today, approximately 190,000 artificial hip surgeries are performed each year in the United States. In more than 90% of patients, the artificial hip joint has a service life of more than 20 years and is a very good treatment for fractures and arthritis. The indications are as follows: l. Fractures of the femoral neck, especially subtrochanteric fractures, which may lead to non-union of the fracture and strongly indicate possible femoral head necrosis in the future. 2, ischemic necrosis of the femoral head, including ischemic necrosis of the femoral head caused by trauma, idiopathic, etc., the femoral head is collapsed and deformed, and the acetabulum has been destroyed. 3, osteoarthritis of the hip, there are changes in the acetabulum, there is pain and functional impairment. 4, rheumatoid arthritis and ankylosing spondylitis, joint pain, deformity, activity limitation. 5, hip joint ankylosis, incomplete bony ankylosis of the hip joint because of pain and deformity. 6, acetabular dysplasia hip deformity.