Compared with the traditional metal hip joint, the zirconia toughened alumina ceramic hip joint has the following characteristics:

it is 1) It has excellent wear resistance. The ceramic surface is an ionic structure with high negative charge and good hydrophilicity which playing the role of self-lubrication. At the same time, it has good wettability and body fluid which can form a thin film on the surface. All of those reduced the friction coefficient and well lubricated the articular. Ceramics can reduce abrasive wear and third objects wear, such as bone tissue, bone cement, metal debris which reducing the wear on the prosthetic load-bearing surfaces. Ceramic - Ceramic is the lowest wear compatibility for hip replacements currently. Research reports have shown that the wear rate of ceramic-polyethylene femoral heads is only half that of metal-polyethylene femoral heads after two million cycles of loading.

it is 2) Higher hardness. Alumina ceramic material is very hard, much higher than metal materials such as cobalt-chromium alloy and titanium alloy, so the parts made by ceramic are not easy to be scratched. However, its brittleness is large, and its tensile strength and fracture toughness are still significantly lower than those of metal materials.

it is 3) More excellent biocompatibility. The concentration of metal ions in the serum of patients with metal-metal prosthesis increases after replacement. The metal particles produced by metal-metal prosthesis are not only toxic to macrophages, but also affect the growth of osteoblasts. The hypersensitivity of human tissues to metal ions will happen after using the metal prostheses. Alumina ceramics are biologically inert materials with stable chemical properties, low histological response, and no corrosion. Ceramic particles are less irritating to tissues than metal particles. The ceramic joints can effectively reduce osteolysis than metal joints because there are smaller particles and tissue reactions by using ceramic joints. The results show that the tissue response of ceramic particles is the lowest, followed by titanium metal, and polyethylene is the largest. Compared to other materials, ceramic is the only material that does not cause fibrogenesis reaction in human body.