Reconstruction of major column defects and pelvic discontinuity in revision total hip arthroplasty.

Acetabular reconstruction with severe bone loss after failed total hip arthroplasty is a difficult problem. Defects were defined as major segmental and cavitary loss (type III anterior or posterior) or pelvic discontinuity (type IV). Seventeen cases were treated, of which 7 were type III and 10 were type IV. Bulk allograft was used in 16 of 17 cases, of which 7 were whole acetabular grafts, 2 were posterior segmental acetabular grafts, and 7 were femoral heads. Fourteen of 17 patients were female. The extensile triradiate approach was used in 12 cases. Long pelvic bone plates were applied to the posterior column and anterior brim of the pelvis in most cases. Allografts united to host-bone in 15 cases. Average follow-up was 83 months. The overall revision rate was 47%, of which 3 of 7 press-fit and 2 of 10 cemented cups had failed. The dislocation rate for the extensile approach was 50%; 2 patients had excisional arthroplasty for infection, and 2 patients had exploration of the sciatic nerve for release from migrating pelvic plate screws. Because of the overall poor results, this approach cannot be recommended for general use.