Resection and reconstruction of pelvic bone tumors.

The objective of this study was to assess outcome and recurrence rate after limb-salvage surgery with reconstruction for pelvic bone tumors and analyze complications and their relationship with surgery. The authors analyzed 129 patients followed for a mean of 6 years (range, 2-19 years). Chondrosarcoma was the most frequent histotype. Thirty-one cases with no acetabular involvement were reconstructed with allograft only. Acetabular resections were reconstructed with allograft prosthetic composite (n=60), allograft only (n=11), trabecular metal components (n=2), prosthesis only (n=10), saddle prosthesis (n=11), and iliofemoral arthrodesis (n=1). Margins were wide (n=94), wide contaminated (n=22), marginal (n=7), and intralesional (n=6). Oncologic outcomes were as follows: 75 patients were continuously disease free, 6 were disease free after treatment of relapse, 13 were alive with disease, 28 were dead of disease, and 5 were dead of other causes. Survival was 66% at 10 years. Local recurrence rate of malignant tumors was 22.1% and was not statistically influenced by margins (P=.140) or site (P=.933). Metastasis rate was 32.8%. Deep infection was observed in 30 (23.6%) cases, with no statistical difference between reconstructions with and without allograft (P=.09). Final external hemipelvectomy was performed in 16 cases. Newer techniques of reconstruction using stemmed acetabular cups or porous metal components combined with allograft are now available. Local control and satisfactory survival is achievable long term in patients with pelvic tumors, but this surgery implies a high rate of complications. Infection is a major complication, not influenced by the use of allografts. Amputation is rarely needed.