The Effect of Prosthesis Orientation on’ stress-Shielding’ using Finite Element Analysis — Indications as to Bone Remodeling

  • P. J. Prendergast
  • B. McCormack
  • T. Gunawardhana
  • D. Taylor
Chapter

Abstract

’stress shielding’ in the proximo-medial femur after hip replacement is studied for different prosthesis stem orientations (valgus — neutral — varus). Both axial and hoop stresses are reported for each case. Results are shown to compare favourably with strain gauge studies. It is predicted that valgus orientated stems create greater axial stress changes and varus orientated stems create greater hoop stress changes. The clinical practice of prosthesis insertion is discussed. Finally the results are analysed in the context of a proposed damage model for bone adaption. It is proposed that the hoop stress has greater significance for the’ stress shielding’ concept than its smaller magnitude would suggest.

Keywords

Bone Loss Bone Remodel Axial Stress Hoop Stress Cement Mantle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Elsevier Science Publishers Ltd 1991

Authors and Affiliations

  • P. J. Prendergast
    • 1
  • B. McCormack
    • 2
  • T. Gunawardhana
    • 3
  • D. Taylor
    • 1
  1. 1.Department of Mechanical EngineeringTrinity CollegeDublin 2Ireland
  2. 2.Department of Mechanical EngineeringUniversity College DublinIreland
  3. 3.EOLAS-The Irish Science & Technology Agency, GlasnevinDublin 9Ireland

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