Fig. 4

Radiographs of the left hip of a 51-year-old woman with ONFH after insertion of the tantalum implant with later conversion to total hip replacement with a ceramic-on-polyethylene bearing. a Pre-operative radiograph. b Anteroposterior postoperative radiograph at 1-year follow-up shows no osteolysis or radiolucencies. Tantalum debris can be observed in the femoral proximal region. c Radiograph at the 7-year follow-up shows no changes