Abstract
Revision ceramic heads with titanium adapter sleeves are used in case of a femoral head revision in total hip arthroplasty to avoid ceramic fracture due to damaged tapers. Objective of the present study was to evaluate the taper connection strength of revision ceramic heads. Therefore, revision ceramic heads (Ø36 mm; adapter sleeve S) and standard ceramic heads (Ø36 mm; neck length S) were assembled with an axial load (2 kN) to titanium tapers with various damage modes (undamaged, truncated, and elevated). Subsequently, the heads were either pulled-off directly after assembly or after dynamic loading over 2.5 million cycles (sinusoidal 0.3 kN–3.0 kN). Pull-off forces of the revision heads (1.24 kN–1.66 kN) were up to 43.7% higher compared to standard heads (1.02 kN–1.48 kN) in dependency of the taper damage. After dynamic loading, the pull-off forces did not change in case of standard heads. The pull-off forces of the revision heads decreased in combination with the undamaged and truncated tapers but increased in combination with the elevated tapers. In conclusion, revision heads with adapter sleeves (size S) showed higher taper connection strength than standard heads both on undamaged and damaged tapers.
Funding source: Bundesministerium für Bildung und Forschung
Award Identifier / Grant number: 03ZZ1027K
About the authors
Danny Vogel studied biomedical engineering at the University of Applied Science in Aachen and at the University of Rostock. He works as a research associate at the Biomechanics and Implant Technology Research Laboratory at the Department of Orthopaedics of the Rostock University Medical Center. He is also head of the experimental biomechanics working group.
Jessica Hembus studied biomedical engineering at the University of Rostock. She works as a research associate at the Biomechanics and Implant Technology Research Laboratory at the Department of Orthopaedics of the Rostock University Medical Center and is a part of the experimental biomechanics working group.
Rainer Bader studied Medicine at the University of Ulm and biomedical engineering at TH Ulm and is currently professor for biomechanics and implant technology at the University of Rostock. Since 2005, he has been head of the Biomechanics and Implant Technology Research Laboratory at the Rostock University Medical Center.
Acknowledgments
The authors also thank the Mathys Orthopädie GmbH (Mörsdorf, Germany) and Aristotech GmbH (Luckenwalde, Germany) for providing the test specimens. The authors gratefully thank the European Union and the LFI of Mecklenburg-Western Pomerania for providing the electrodynamic testing machine Zwick LTM (reference number GHS-16-0001) and the digital microscope (VHX-6000, reference number GHS-16-0002). Last not least, the authors thank Dr. Annett Klinder for her support regarding the statistical analysis.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: The authors kindly thank the Federal Ministry of Education and Research (BMBF) for granting this research project (BMBF No.: 03ZZ1027K).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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