Constrained total hip megaprosthesis for primary periacetabular tumors

Area of Science:

• Orthopaedic Oncology
• Surgical Reconstruction
• Tumor Surgery

Background:

• Periacetabular malignant tumors present significant reconstructive challenges in orthopaedic oncology.
• Existing reconstructive options lack standardization due to disease rarity and variability.
• A constrained total hip mechanism (C-THA) megaprosthesis was previously developed for this purpose.

Purpose of the Study:

• To evaluate patient survival and C-THA implant survival.
• To assess postoperative functional outcomes.
• To identify and analyze postoperative complications.

Main Methods:

• Retrospective review of 25 patients with primary periacetabular tumors treated with C-THA (1985-2009).
• Analysis of patient demographics, tumor types, surgical margins, and follow-up duration.
• Evaluation of survival rates, functional status, and complication incidence.

Main Results:

• The 10-year overall survival rate was 47%; C-THA implants survived in 19 of 25 patients.
• Twenty-one patients achieved ambulatory activity post-surgery.
• Complications included deep infection (8/25), dislocation (4/25), and aseptic loosening (2/25), requiring revision surgeries.

Conclusions:

• Constrained total hip mechanism (C-THA) with an acetabular reconstruction cup is a useful option for periacetabular malignant tumor resection.
• The procedure offers a viable reconstructive solution despite a notable rate of postoperative complications.
• Further research may focus on mitigating complications associated with C-THA in this patient population.