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Validation of FE Micromotions and Strains Around a Press-Fit Cup: Introducing a New Micromotion Measuring Technique

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Abstract

Finite element (FE) analysis provides an useful tool with which to analyze the potential performance of implantations in a variety of surgical, patient and design scenarios. To enable the use of FE analysis in the investigation of such implants, models must be experimentally validated. Validation of a pelvic model with an implanted press-fit cup in terms of micromotion and strain is presented here. A new method of micromotion has been introduced to better describe the overall movement of the cup within the pelvis. The method uses a digitizing arm to monitor the relative movement between markers on the cup and the surrounding acetabulum. FE analysis was used to replicate an experimental set up using a synthetic hemi-pelvis with a press-fitted all-metal cup, subject to the maximum loading observed during normal walking. The work presented here has confirmed the ability of FE models to accurately describe the mechanical performance of the press-fitted acetabulum and surrounding bone under typical loading conditions in terms of micromotion and strain distribution, but has demonstrated limitations in its ability to predict numerical micromotion values. A promising digitizing technique for measuring acetabular micromotions has also been introduced.

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Acknowledgments

The authors would like to thank the Engineering and Physical Sciences Research Council (EPSRC) and Finsbury Orthopaedics Ltd. for supporting this work.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Imperial College London, Skempton Building, South Kensington Campus, London, SW7 2AZ, UK

    S. G. Clarke & A. T. M. Phillips

  2. Department of Bioengineering, Imperial College London, Royal College of Mines Building, South Kensington Campus, London, SW7 2AZ, UK

    A. M. J. Bull

Authors
  1. S. G. Clarke
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  2. A. T. M. Phillips
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  3. A. M. J. Bull
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Correspondence to S. G. Clarke.

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Associate Editor Peter E. McHugh oversaw the review of this article.

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Clarke, S.G., Phillips, A.T.M. & Bull, A.M.J. Validation of FE Micromotions and Strains Around a Press-Fit Cup: Introducing a New Micromotion Measuring Technique. Ann Biomed Eng 40, 1586–1596 (2012). https://doi.org/10.1007/s10439-012-0523-6

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  • DOI: https://doi.org/10.1007/s10439-012-0523-6

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