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Obejective:To evaluate clinical and radiographic outcomes of metal-on-metal hip arthroplasty. Methods: From January 2005 to December 2009,78 patients(87hips) underwent metal-on-metal hip arthroplasty in Affiliated hospital of Nantong university were involved in this study.There were 43 cases(48 hips) of metal-on-metal total hip arthroplasty(MoM THA) and 35 cases(39 hips) of metal-on-metal hip resurfacing arthroplasty(MoM HRA),respectively.Radiographic study and postoperative complications were recorded.The Harris score,OHS score and PMA score were used to assess the functional outcomes.