Purpose

To investigate the prognostic effect of surgical margins in soft tissue sarcoma on Local Recurrence (LRFS), Metastasis (MFS) and Disease Free Survival (DFS).

Introduction. Although various reports analyzed “en-bloc” excision of sacral tumors, there are still technical problems to improve protection of nerve roots, preserve surrounding structures and reduce intraoperative bleeding, maintaining the oncologic result. We present a new technique for sacral resection, with short term preliminary results, derived with modification from Osaka technique. Methods. Seven patients were resected for their sacrococcygeal chordoma with the followed described technique. Two patients had previous surgery elsewhere. The sacrum is exposed by a posterior midline incision and complete soft-tissue dissection. Lateral osteotomies were performed through the sacral foramina using a threadwire saw and Kerrison rongeurs, to avoid sacral roots damage. After proximal osteotomy, the sacrum is laterally elevated and mobilized to allow dissection of presacral structures. Mean surgical time was 5 hours (range: 3 to 8). Mean blood loss was 3640 ml. Results. Level of resection was S1 in 2 pts, S2 in 4 pts, S3 in 1. Margins were wide in 6 patients and marginal in one. At a mean follow-up of 2 years, six patients were disease-free, one had a local recurrence. No complications were showed. Conclusion. This technique allows wide margins with roots preservation and reduction of complications and operative time. Indications for posterior approach only can be extended to resection proximal to S3, when there is minimal pelvic invasion and none or partial involvement of sacroiliac joints. However, the long term benefits of this technique need to be evaluated