Tribological performance of ultra-high-molecular-weight polyethylene sliding against DLC-coated and nitrogen ion implanted CoCrMo alloy measured in a hip joint simulator

► DLC film and N+ ion implantation were applied respectively on CoCrMo joint head. ► The tribological properties of CoCrMo/UHMWPE joint were studied by hip joint simulator. ► The UHMWPE had a higher wear rate sliding against DLC coated or N+ implanted head.