Severe metallosis in an isoelastic hip prosthesis

Severe black staining due to metallic wear debris has been reported in metal-on-metal hip prosthesis(3). This problem is not commonly seen because of the popular use of metal-on-polyethylene component and has not been previously reported with the use of isoelastic femoral prosthesis. We report a case of severe metallosis in an isoelastic prosthesis, four years after implantation.