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Related Experiment Videos

Computational bone remodelling simulations and comparisons with DEXA results.

A W L Turner1, R M Gillies, R Sekel

  • 1Orthopaedic Research Laboratories, University of New South Wales, Prince of Wales Hospital, L2 South Wing, Edmund Blacket Bldg, High St, Randwick, Sydney NSW 2031, Australia.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|July 19, 2005
PubMed
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This study predicts bone density changes after hip replacement using a modified strain-adaptive theory and finite element models. The model accurately reflects clinical bone loss, aiding implant design and selection.

Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Materials Science

Background:

  • Femoral periprosthetic bone loss after total hip replacement is linked to stress shielding, potentially causing implant failure and complicating revision surgery.
  • Understanding and predicting bone resorption around implants is crucial for improving long-term outcomes and surgical success.

Purpose of the Study:

  • To modify and apply a strain-adaptive bone remodelling theory combined with 3D finite element models.
  • To predict periprosthetic apparent bone density changes for different femoral component designs.
  • To validate the theoretical predictions against clinical bone densitometry data.

Main Methods:

  • Anatomical 3D finite element models were created for three femoral components with varying materials and coatings.

Related Experiment Videos

  • A modified strain-adaptive bone remodelling theory, incorporating equivalent strain stimulus and gait cycle forces, was used for simulations.
  • Simulated bone density changes were compared with clinical dual-energy X-ray absorptiometry (DEXA) measurements over 2 years.

    • Main Results:

    • Theoretical bone density predictions showed significant correlation with clinical DEXA measurements across Gruen zones (R2>0.67, p<0.02).
    • Average differences between predicted and measured bone density were less than 5.4%.
    • The study successfully simulated adaptive bone remodelling for different implant designs.

    Conclusions:

    • A consistent mechanical stimulus theory can explain a significant portion of adaptive bone remodelling observed clinically.
    • The validated theoretical model offers potential for pre-clinical implant testing and design optimization.
    • This approach may aid in patient-specific implant selection for total hip replacements.