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Related Experiment Videos

Trabecular bone modulus-density relationships depend on anatomic site.

Elise F Morgan1, Harun H Bayraktar, Tony M Keaveny

  • 1Orthopaedic Biomechanics Laboratory, Department of Mechanical Engineering, University of California, 6175 Etcheverry Hall, Berkeley, CA 94720-1740, USA.

Journal of Biomechanics
|May 22, 2003
PubMed
Summary
This summary is machine-generated.

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The relationship between bone density and elastic modulus varies by anatomical site, with tibia and trochanter specimens showing higher moduli than vertebral and femoral neck specimens. This site-specificity is linked to architectural differences.

Area of Science:

  • Biomechanics
  • Orthopedic Research
  • Materials Science

Background:

  • The relationship between elastic modulus and density in trabecular bone is crucial for understanding bone mechanics.
  • It remains unclear whether this relationship is consistent across different anatomical locations in the human skeleton.

Purpose of the Study:

  • To investigate if the elastic modulus-density relationship in human trabecular bone is dependent on anatomical site.
  • To quantify site-specific differences and their impact on mechanical property predictions.

Main Methods:

  • Measured on-axis elastic moduli and apparent densities of 142 human trabecular bone specimens from vertebra, proximal tibia, femoral greater trochanter, and femoral neck.
  • Utilized experimental protocols minimizing end-artifact errors and controlling specimen orientation.

Related Experiment Videos

  • Computed tissue moduli using high-resolution linear finite element analyses for a subset of specimens.

    • Main Results:

    • Power law regressions between modulus and density were found to be site-dependent, with significant differences in leading coefficients (p<0.02) but not exponents.
    • Specimens from the tibia and trochanter exhibited significantly higher moduli than those from the vertebra and femoral neck at equivalent densities.
    • Ignoring site-dependence led to substantial errors (up to 65%) in predicted modulus values.

    Conclusions:

    • A universal modulus-density relationship for on-axis loading in human trabecular bone does not exist.
    • Site-specific variations in trabecular bone architecture are the likely cause of the observed differences in apparent modulus-density relationships.