Scoops of success: outcomes in a series of 13 patients using a cone cup prosthesis for acetabular reconstruction

Abstract

Background: Endoprosthetic reconstruction of major pelvic bone loss in oncology and revision arthroplasty surgery is associated with high complication rates. However, comparative data for reconstructive methods are limited. We present short-term clinical, radiological and functional outcomes of the Implantcast MUTARS^® LUMiC^® prosthesis for acetabular reconstruction after major pelvic bone resection or loss.

Methods: A retrospective folder review was performed from December 2019 to June 2022. The minimum follow-up period was 12 months. The inclusion criterion was all patients who underwent acetabular reconstruction with the Implantcast MUTARS^® LUMiC^® cone cup prosthesis.

Results: Thirteen patients were included in the study. The indication for pelvic resection was a primary bone tumour in seven patients, metastatic bone disease in three and failed arthroplasty in three. Complications, as classified by the Henderson classification, occurred in 38% and included two patients with dislocation, three with infection, and one of whom had both. Other complications included sciatic nerve neuropraxia, iatrogenic fracture of the greater trochanter, and vascular injury. The median Musculoskeletal Tumor Society Score (MSTS) scores at 12 months assessed in eight patients were 21 of 30 points.

Conclusion: Our results are in agreement with other series, and highlight the problems of instability and deep infection. Patients without complications had an acceptable functional outcome.

Level of evidence: Level 4