[Translated article] Use of "ice-cream cone" prosthesis in acetabular defects secondary to tumor resections

The treatment of pelvic tumors, particularly in the periacetabular region (zone II of the Enneking and Dunham classification), represents a significant challenge for orthopedic oncologic surgeons due to the anatomical complexity and the need to preserve hip function. "Ice-cream cone" prostheses have emerged as a promising reconstructive option due to their versatility and potential to reduce infection rates, although evidence regarding their effectiveness remains limited.

A retrospective cohort of patients with pelvic bone tumors treated with "ice-cream cone" prostheses between 2016 and 2023 at a single tertiary care center was analyzed. Patients with tumors affecting zone II and undergoing preservation of zone Ia were included. Surgical variables, complications, functionality, recurrence, and mortality were evaluated.

Ten patients met the inclusion criteria. The median age was 50 years, with a mean follow-up of 26.4 months. Chondrosarcoma was the most common tumor (60%). All surgeries achieved negative oncologic margins. The median postoperative score on the Musculoskeletal Tumor Society (MSTS) scale was 22.5 points (range: 12-28). No local recurrence was observed, although one patient developed metastases and another died due to complications of chronic kidney disease.

The use of "ice-cream cone" prostheses for acetabular defects following oncologic resection appears to be a safe and effective technique in selected patients, offering good functional outcomes and high satisfaction, with complication rates comparable to other alternatives.