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A novel method for measuring acetabular cup deformation in cadavers.

Martin C Bone1, Philipp Dold, Markus Flohr

  • 1School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne, UK.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|October 24, 2013
PubMed
Summary

Acetabular shell deformation during surgery was measured using optical scanning. Results indicate that shell size influences the degree of deformation, potentially impacting implant performance.

Keywords:
Acetabular cup deformationcadaveroptical measurement system

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Medical Device Technology

Background:

  • Press-fit acetabular shells undergo compressive forces during surgical insertion.
  • Shell deformation can negatively influence the fit and function of the acetabular liner.
  • Accurate measurement of intraoperative deformation is crucial for understanding implant behavior.

Purpose of the Study:

  • To describe a method for quantifying acetabular shell deformation during surgical implantation.
  • To assess the extent of deformation in custom-made titanium acetabular shells in a cadaver model.
  • To investigate potential correlations between shell size and deformation magnitude.

Main Methods:

  • Utilized an optical GOM ATOS Triple Scan system for high-resolution 3D surface scanning.
  • Performed pre- and post-insertion scans of six custom titanium acetabular shells in three cadavers.
  • Analyzed 3D color maps and cross-sections at the shell rim to determine diametrical deformation.

Main Results:

  • Measured acetabular shell deformation ranging from 30 to 150 micrometers.
  • Observed a trend suggesting that larger acetabular shells may exhibit greater deformation.
  • The optical scanning method provided precise, quantitative data on shell geometry changes.

Conclusions:

  • The study successfully demonstrated a method to measure acetabular shell deformation in a cadaver model.
  • Acetabular shell size appears to be a significant factor influencing intraoperative deformation.
  • Understanding and quantifying this deformation is vital for optimizing acetabular component design and surgical technique.