Treatment of retroacetabular osteolysis with calcium sulfate and retention of original components.

Restoration of retroacetabular bone stock by curettage and grafting with synthetics would obviate the need for autograft or allograft bone and prevent bone loss associated with revision. We conducted a clinical and radiographic review of 7 patients with progressive retroacetabular osteolysis. The size of the lesions ranged from 3.1 x 2.0 to 9.0 x 5.3 cm(2). All patients were treated with curettage and filling of the defects with calcium sulfate. Mean follow-up time was 48 months. On follow-up evaluation, there was resolution of 4 lesions, good osseous integration of 2 lesions, and no progression of 1 lesion. Curettage and grafting of progressive retroacetabular osteolysis with calcium sulfate and retention of components result in good osseous integration of the graft and halt the progression of lysis.