The service life of artificial hip joints With the advancement of technology and material science, the main metal materials used in artificial hip joints are “titanium, aluminum, tetra-vanadium” and “cobalt-chromium-molybdenum alloy”, while the friction interface is the part of the material in contact with each other: the hip joints are divided into ceramic-to-ceramic, ceramic-to-polyethylene, metal-to-polyethylene and metal-to-metal (already eliminated). ceramic, ceramic to polyethylene, metal to polyethylene, metal to metal (already eliminated). What does the life of an artificial hip joint mean? It is mainly the time between no wear and tear of the friction interface and the time of severe wear leading to unstable discomfort. Generally speaking, the life span of a hip joint is 15-20 years for four generations of ceramic to polyethylene; and more than 30 years for four generations of ceramic to four generations of ceramic.