For patients with advanced femoral head necrosis, hip replacement is the best surgical option and can greatly improve the quality of life of the patient. However, the wear and tear of the artificial hip prosthesis is always an important problem for patients and doctors, because of the wear and tear of the prosthesis, the life span of the commonly used metal-high polymer polyethylene joint prosthesis is usually 15-20 years, and after 15-20 years patients face the problem of reoperation. The emergence of ceramic-ceramic prosthesis is a real blessing for patients, as the wear and tear of ceramic-ceramic hip prosthesis is only 1/200th of that of metal-high polymer polyethylene joint prosthesis, which means that ceramic-ceramic hip prosthesis can last many times longer than metal-high polymer polyethylene joint prosthesis, so that patients may be able to solve their lifelong problem with just one surgery. The problem is that the ceramic-ceramic hip prosthesis lasts many times longer than the metal-Polyethylene one. However, ceramic-ceramic hip prostheses are more expensive, but they are worth it for the long service life. Our department has a lot of experience in the use of ceramic-ceramic hip prostheses, which have relieved the pain of many patients and achieved excellent clinical results. The Biomet and Stryker ceramic-ceramic artificial hip joints used by our group are both made of alumina ceramics, and the ceramic material is Bioloxforte, the third generation of Biolox, which is a biologically inert material. Moreover, Bioloxforte is a hard material with the highest modulus of elasticity among all biomaterials at 380 Gpa, and the femoral head made of it! The acetabular cup lining will not be deformed under stress, and because of its excellent wettability, the coefficient of friction is close to 0. “Therefore, the wear and tear is minimal and resistant to wear and tear” Biomet and Stryker ceramic-ceramic artificial hip acetabular prosthesis introduction: In the acetabular design and structure of the two differences “Biomet socket prosthesis is a sandwich non-wear socket, using a metal base with polymer polyethylene lining, The ceramic-polyethylene liner is made by a conical press-fit locking method, and the concave edge of the liner matches the raised outer edge of the metal cup for excellent stability. Stryker socket prosthesis is Secur-FitTM HA full ceramic joint, its socket prosthesis using HA coated titanium metal base with ceramic lining, ceramic lining and metal cup between the application of tapered locking mechanism fixed, the characteristics of the metal base socket edge expansion, so that the ceramic lining is lower than the metal base socket edge “design concept for this HA cup design and dual anatomical structure to increase the pressure of the central axis and reduce the pressure at both ends At the same time, the enlargement of the bottom socket edge changes the point of impact between the shank and the cup, which enhances the stability of the socket and prolongs the service life of the prosthesis.