Revision total hip arthroplasty in hip joints with metallosis: a single-center experience with 31 cases.

Clinical and radiographic findings of metallosis in relation to the clinical outcome of revision total hip arthroplasty were analyzed for 31 hips. Causes of metallosis were dissociation of polyethylene liner in 24 hips, catastrophic wear in 6, and the screw used for stem fixation in 1. Metallosis was grade I in 12 hips, grade II in 7, and grade III in 12. Osteolysis around the acetabular cup was observed in 24 (77.4%) of 31 hips. At the time of final follow-up evaluation, none of the hips showed osteolysis, acetabular cup migration, or any change in inclination. Although metallosis could not be completely eradicated in severe cases, the clinical outcome for these hips was favorable. This study demonstrates that metallosis frequently causes osteolysis and that complete elimination of it is not a prerequisite for the success of revision total hip arthroplasty.