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Deutscher Kongress für Orthopädie und Unfallchirurgie (DKOU 2023)

24. - 27.10.2023, Berlin

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Mid-term migration behavior of an uncemented proximal anchored straight stem – a retrospective EBRA-FCA migration analysis

Meeting Abstract

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  • presenting/speaker Philipp Blum - BG Unfallklinik Murnau, Klinik für Unfallchirurgie Orthopädie und Chirurgie, Murnau, Germany
  • Johannes Neugebauer - Universitätsklinikum Krems, Abteilung Orthopädie und Traumatologie, Krems an der Donau, Austria
  • Alexander Keiler - Medizinische Universität Innsbruck, Universitätsklinik für Orthopädie und Traumatologie, Innsbruck, Austria
  • David Putzer - Medizinische Universität Innsbruck, Abteilung für Experimentelle Orthopädie, Innsbruck, Austria
  • Julius Watrinet - BG Unfallklinik Murnau, Klinik für Unfallchirurgie Orthopädie und Chirurgie, Murnau, Germany
  • Sebastian Biermeier - Medizinische Universität Innsbruck, Innsbruck, Austria
  • Dietmar Dammerer - Universitätsklinikum Krems, Abteilung Orthopädie und Traumatologie, Krems an der Donau, Austria

Deutscher Kongress für Orthopädie und Unfallchirurgie (DKOU 2023). Berlin, 24.-27.10.2023. Düsseldorf: German Medical Science GMS Publishing House; 2023. DocAB82-2878

doi: 10.3205/23dkou443, urn:nbn:de:0183-23dkou4431

Veröffentlicht: 23. Oktober 2023

© 2023 Blum et al.
Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). Lizenz-Angaben siehe http://creativecommons.org/licenses/by/4.0/.

Gliederung

Text

Objectives: Aseptic loosening represents one of the most common reasons for failure of cementless stems. EBRA-FCA allows the determination of stem migration, which is considered a predictive factor for implant survival. The current study aims to present the migration behavior of a tapered proximally anchored straight stem.

Methods: This retrospective study reviewed all consecutive patients who received a cementless CBC straight stem (Mathys AG, Bettlach, Switzerland) between 2005 and 2019. We analyzed the migration pattern by using EBRA-FCA software and reviewed medical histories. In addition, periprosthetic radiolucency was rated according to the zones of Gruen and femoral configuration according to Dorr.

Results and conclusion: A total of 333 stems in 332 patients (female 191; male 141) fulfilled our inclusion criteria. Mean age at surgery was 63.1 (range 20.8–87.4) years. EBRA-FCA migration analysis showed a mean subsidence of 1.6 mm at final follow-up of 96 months with a maximum noted mean subsidence of 2.0 mm at 72 and 84 months. Dorr type A showed a tendency to lower subsidence then Dorr type B with being statistically significant at 6 (p=0.0396) and 72 months (p=0.0127). No correlation between body mass index and increased subsidence was found (p > 0.05). For this cohort, the overall femoral revision-free rate was 95.2% and the revision-free rate for aseptic loosening was 99.1%.

The results show an in cementless stems established migration behavior with initial increased migration and subsequent secondary stabilization, suggesting an excellent long-term outcome. Stem migration of this tapered proximally anchored stem might be lower in Dorr type A than in Dorr type B femurs without being statistically significant at all time points.