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  • Editor in Chief: Prof. Andrea Remuzzi
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Vol. 36 Issue 1 (January 2013)

Third-body abrasive wear of tibial polyethylene inserts combined with metallic and ceramic femoral components in a knee simulator study

Third-body abrasive wear of tibial polyethylene inserts combined with metallic and ceramic femoral components in a knee simulator study

Int J Artif Organs 2013; 36(1): 47 - 55

Article Type: ORIGINAL ARTICLE

DOI:10.5301/ijao.5000189

Authors

Carmen Zietz, Philipp Bergschmidt, Regina Lange, Wolfram Mittelmeier, Rainer Bader

Abstract

Aim: Total knee arthroplasties have reached a high grade of quality and safety, but most often fail because of aseptic implant loosening caused by polyethylene wear debris. Wear is generated at the articulating surfaces, e.g. caused by third-body particles. The objective of this experimental study was to determine the wear of tibial polyethylene inserts combined with metallic and ceramic femoral components under third-body wear conditions initiated by bone cement particles.
Methods and Materials: Wear testing using a cemented unconstrained bicondylar knee endoprosthesis (Multigen Plus CR knee system) was performed in a knee wear simulator. Tibial polyethylene inserts were combined with the identical femoral component design, but made of two different materials (cobalt-chromium and ceramic). Bone cement debris including zirconium oxide particles was added every 500,000 cycles between the articulating surfaces. After 5 million load cycles, the amount of wear was determined gravimetrically and compared with results from standard wear test conditions. The surfaces of tibial inserts were also analyzed.
Results: The average gravimetrical wear of the tibial polyethylene inserts in combination with 
cobalt-chromium and ceramic femoral components under third-body wear conditions amounted to 31.88 ± 4.53 mg and 13.06 ± 1.88 mg after 5 million cycles, respectively, and was higher than under standard wear test conditions in both cases.
Conclusions: The wear simulator test demonstrates that wear of polyethylene inserts under third-body wear conditions, in combination with ceramic femoral components, was significantly lower than with metallic femoral components.

Article History

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Authors

  • Zietz, Carmen [PubMed] [Google Scholar]
    Department of Orthopedics, University Medicine Rostock, Rostock - Germany
  • Bergschmidt, Philipp [PubMed] [Google Scholar]
    Department of Orthopedics, University Medicine Rostock, Rostock - Germany
  • Lange, Regina [PubMed] [Google Scholar]
    Institute for Electronic Appliances and Circuits, University of Rostock, Rostock -Germany
  • Mittelmeier, Wolfram [PubMed] [Google Scholar]
    Department of Orthopedics, University Medicine Rostock, Rostock - Germany
  • Bader, Rainer [PubMed] [Google Scholar]
    Department of Orthopedics, University Medicine Rostock, Rostock - Germany

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