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Beitragstitel Excellent long-term results of the Müller acetabular reinforcement ring in primary cup revision
Beitragscode P036
  1. Pascal Müller Greber Luzerner Kantonsspital Wolhusen Vortragender
  2. Isabella Manzoni Kantonsspital Baselland
  3. Peter Ochsner Private consultation
  4. Thomas Ilchmann Hirslanden Klinik Birshof, ENDO-Team
  5. Lukas Zwicky Kantonsspital Baselland
  6. Martin Clauss Universätsspital Basel
Präsentationsform Poster
  • A4 - Hüfte
Abstract 1. Introduction
The original Müller acetabular reinforcement ring (ARR) was developed for acetabular revisions with small cavitary and/or segmental defects or when acetabular bone quality is poor. Long-term data for this device are scarce. We therefore investigated long-term survival and radiological results for revision THA using the ARR.

2. Methods:
Between 01/1984 and 12/2005, 259 consecutive primary acetabular revision using an original ARR were performed in 245 patients. The mean follow-up time was 10 (0 – 27) years, 8 hips were lost to follow-up. For survival analysis, we investigated 259 hips and the end of the follow-up was defined either by the date of revision, date of death, or the last patient contact date with implant still in situ. Radiological assessment was performed for 90 hips with a radiological follow-up of a minimum of 10 years. It included evaluation of osteolysis, migration and loosening.

3. Results:
16 ARR were re-revised: 8 for aseptic loosening, 6 combined with the stem, 6 for infection, 1 due to mal-positioning of the cup and 1 for suspected infection. The cumulative re-revision rate for all components, for any reason, at 20 years was 16 (95% CI: 10-23), while for the ARR only it was 11% (95% CI: 5-17) for any reason and 6% (95% CI: 2-11) for aseptic loosening. 21 (23%) of the 90 radiological examined ARR had radiological changes: 12 showed isolated osteolysis but were not loose. 9 ARRs were determined radiologically loose on follow-up, 5 of them had been revised.

4. Conclusion:
Our data suggests that the long-term survival of the ARR in primary acetabular revision is excellent.