Metallosis in metal-on-metal PPF total hip arthroplasties

Abstract

Metallosis in total hip arthroplasty (THA) is a not commonly reported complication. We followed 173 consecutive patients, who had received primary, single and non-cemented proximal press fit (PFF) THA with metal-on-metal bearings made of low carbon content in 1995. Follow-up results are available for a total of 161 (93.1%) patients. The mean age of the patients was 63.3 years (31 to 76). The mean duration of follow-up was 94.5 months (range, 57 to 112). The median Harris hip score at follow-up was 95 points. 36 (20.8%) metallosis cases were observed. 18 cases because of metallosis were revised. Dislocation in metallosis cases occurred in 25%. Revisions were obtained because of 2 femur fractures (1 with metallosis) and 5 infections. The results with metal-on-metal bearings were not satisfactory. Toxic metal concentrations in joint effusions were found. We do not implant or recommend metal-on-metal bearings in total hip arthroplasty anymore.