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Is Functional Reconstruction Feasible With Modified Hip Transposition Using a Customized 3D-printed Femoral

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|March 10, 2026
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This study introduces a modified hip transposition technique using 3D-printed prostheses for pelvic tumor reconstruction, achieving good functional outcomes and minimal limb length discrepancy. The novel approach offers a promising solution for complex cases, reducing complications and improving patient mobility.

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Area of Science:

  • Orthopaedic Oncology
  • Reconstructive Surgery
  • Biomedical Engineering

Background:

  • Reconstruction after pelvic tumor resection (zones I + II ± IV) presents significant challenges.
  • Conventional hip transposition can lead to limb shortening and malrotation.
  • A modified technique using 3D-printed prostheses aims to improve limb length, femoral positioning, and stability.

Purpose of the Study:

  • Evaluate postoperative functional outcomes (Musculoskeletal Tumor Society 1993 score).
  • Assess the frequency and nature of complications.
  • Determine limb length restoration at a minimum 3-year follow-up.

Main Methods:

  • A modified hip transposition with a 3D-printed femoral lengthening and retroversion prosthesis was used in 9 patients.
  • Patients had pelvic zone I + II ± IV tumors, suitable proximal femur preservation, and were ineligible for standard reconstruction.
  • Functional outcomes, complications, and limb-length discrepancy (LLD) were assessed.

Main Results:

  • Six surviving patients achieved a median Musculoskeletal Tumor Society 1993 score of 24, with minimal pain.
  • Two patients walked independently, four used a cane.
  • Median postoperative LLD was 1.0 cm; no prosthetic infections or mechanical failures occurred.

Conclusions:

  • The modified hip transposition technique with 3D-printed prostheses effectively adjusted limb length and femoral rotation.
  • Minimal LLD and no major complications were observed in this small series.
  • Further research with larger cohorts and longer follow-up is needed to confirm its benefits.