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Total hip replacement is the process of completely removing the existing hip joint and replacing it with an artificial hip.The goal of THR is to improve the patients quality of life by reducing pain in the hip and restoring function to the hip.However,the friction and wear of artificial hip joints in human body is more complicated.Environmentally (biochemical) conditions in the body are harsh,biomechanical requirements are complex and variable,and the biological response to wear particles is largely unknown and dependent on the genetic profile of the recipient.The complications consisting of loosening and dislocation of the implant will result in failure of THR.They can have devastating effects on the patient,and can ultimately lead to an unsuccessful THR.Therefore,finding a ‘low wear and less harm’ hip joint has been the main goal of biotribology research of THR.