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Acetabular shell deformation as a function of shell stiffness and bone strength.

Philipp Dold1, Thomas Pandorf2, Markus Flohr2

  • 1Medical Products Division, CeramTec GmbH, Plochingen, Germany p.dold@ceramtec.de.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|February 19, 2016
PubMed
Summary

Hip replacement acetabular shells can deform upon implantation. This study modeled shell deformation, finding no direct correlation between shell stiffness and deformation, indicating bone properties significantly influence stability.

Keywords:
Biomechanical testing/analysisacetabular shell deformationacetabular shell stiffnesscombined stiffnesship prostheses

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Biomechanics

Background:

  • Press-fit acetabular shells are crucial for hip replacement initial stability.
  • Shell deformation during implantation can impact joint performance and longevity.
  • Understanding the interplay between shell properties and bone is vital.

Purpose of the Study:

  • To model acetabular shell deformation based on shell stiffness and bone strength.
  • To quantify shell deformation and the forces exerted by bone during press-fit implantation.

Main Methods:

  • 32 acetabular shells (3 & 4mm thickness, 44-62mm diameter) were implanted in 8 cadavers.
  • Shell deformation was measured using an optical system (ATOS Triple Scan III).
  • The shell-bone interface was modeled as a spring system to calculate bone stiffness and forces.

Main Results:

  • Median radial stiffness differed significantly between 3mm (4192 N/mm) and 4mm (9633 N/mm) shells.
  • Median shell deformation was 48µm, with a median force of 256N.
  • No significant correlation was found between shell stiffness and deformation; deformation was asymmetric.

Conclusions:

  • Acetabular shell deformation is influenced by factors beyond shell stiffness, notably bone properties.
  • Further research is needed to fully elucidate the role of bone characteristics in shell deformation.
  • Asymmetric deformation suggests complex biomechanical interactions at the implant-bone interface.