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The Effects of Interfacial Conditions and Stem Length on Potential Failure Mechanisms in the Uncemented Resurfaced Femur

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Abstract

It is hypothesized that changes in stem length and implant–bone interfacial conditions would affect the mechanical environment within the uncemented resurfaced femur, thereby influencing potential short- and long-term failure mechanisms. This study is aimed at investigating the influence of changes in implant–bone interfacial conditions and stem length on eventual failure, using 3D FE models integrated with bone remodeling simulations. Musculoskeletal forces corresponding to normal walking and stair climbing were used as applied loading conditions. Sliding micromotions of 26–72 μm at the implant–bone interfaces for both the stem designs suggest bone ingrowth on the coated surface of the implant was likely. The initial risk of femoral neck fracture was less for the uncemented designs as compared to the cemented designs, irrespective of interfacial conditions and variation in stem length. For the uncemented variety, shortening the stem length provided only slight advantages (5%) with regard to strain shielding and bone remodeling. However, bone resorption was considerably higher when fully bonded interfaces were simulated. It may, therefore, be concluded that cementless fixation seems to be a viable alternative to cemented fixation, provided sufficient initial fixation and secondary stability through bone ingrowth into the coated surface of the implant can be achieved.

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Acknowledgments

The authors thank UKIERI British Council, DePuy International, UK and Department of Biotechnology, New Delhi, India, for supporting this study.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, 721 302, West Bengal, India

    Sanjay Gupta & Bidyut Pal

  2. Bioengineering Science Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom

    Andrew M. R. New

Authors
  1. Sanjay Gupta
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  2. Bidyut Pal
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  3. Andrew M. R. New
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Correspondence to Sanjay Gupta.

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Associate Editor Michael S. Detamore oversaw the review of this article.

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Gupta, S., Pal, B. & New, A.M.R. The Effects of Interfacial Conditions and Stem Length on Potential Failure Mechanisms in the Uncemented Resurfaced Femur. Ann Biomed Eng 38, 2107–2120 (2010). https://doi.org/10.1007/s10439-010-0007-5

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  • DOI: https://doi.org/10.1007/s10439-010-0007-5

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