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Related Experiment Videos

Wear in retrieved Charnley acetabular sockets

R M Hall1, A Unsworth, P Siney

  • 1Centre for Biomedical Engineering, University of Durham.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|January 1, 1996
PubMed
Summary

This study analyzed 129 explanted acetabular components, finding that cement ingress occurs early. Clinical wear rates were higher than laboratory findings, with femoral head roughness impacting wear.

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Tribology

Background:

  • Analysis of 129 explanted Charnley acetabular components from revision surgeries.
  • Tribological investigation focused on wear mechanisms and penetration depth.

Discussion:

  • Pitting suggests early cement ingress; creep is not a major factor in socket wear.
  • Mean penetration and wear volume rates align with existing retrieval data.
  • Clinical wear factor (Kclinical) significantly exceeds laboratory results.

Key Insights:

  • A mean clinical wear factor of 2.1 x 10(-6) mm3/N m was calculated.
  • Significant positive intercept suggests initial creep, as seen in simulator studies.
  • Femoral head roughness (Ra) shows a strong positive association with Kclinical.

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Outlook:

  • Further research needed to reconcile in vivo and in vitro wear factor discrepancies.
  • Understanding the role of initial creep is crucial for improving implant design.
  • Investigating the impact of femoral head surface topography on long-term implant performance.