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[Titanium modular revision prosthesis stem in revision hip prosthesis].

A Schuh1, U Holzwarth, G Zeiler

  • 1Orthopädische Klinik, Rummelsberg-Schwarzenbruck. Schuh-Alexander@t-online.de

Der Orthopade
|January 30, 2004
PubMed
Summary

The titanium modular revision prosthesis (MRP) stem is a reliable implant for hip revision arthroplasty, showing significant functional improvements and stable fixation in most patients. This study reports positive midterm outcomes for this cementless revision stem.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Medical Device Technology

Background:

  • Revision hip arthroplasty frequently requires long femoral stems to bridge defects and fractures.
  • The titanium modular revision prosthesis (MRP) stem, made of Ti6Al7Nb alloy, offers customizable, load-stable reconstructions.
  • Precise adaptation to the cortical tube diameter and distal placement are crucial for implant success.

Purpose of the Study:

  • To evaluate the initial clinical and radiological outcomes of the titanium MRP revision stem in hip revision arthroplasty.
  • To assess the efficacy and reliability of this cementless implant in complex cases.

Main Methods:

  • Midterm analysis of 130 non-cemented hip revision arthroplasties using the titanium MRP revision stem.
  • Follow-up duration ranged from 1 to 8 years (mean 2.9 years).

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  • Indications included aseptic loosening, Girdlestone situations, and periprosthetic fractures.

    • Main Results:

    • Significant improvement in Harris hip score (50.9 to 88.5) and Merle d'Aubigné score (9.8 to 15.2).
    • Stable primary fixation achieved in 129 out of 130 cases.
    • Complications included dislocations, nerve lesions, infections, fractures, and one case requiring revision due to subsidence.

    Conclusions:

    • The titanium MRP revision stem demonstrates high reliability in cementless revision hip arthroplasty.
    • The implant facilitates successful load-stable reconstruction in challenging cases.
    • Functional outcomes are significantly improved, despite a low rate of complications.