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Mechanical properties of trabecular bone. Dependency on strain rate.

F Linde1, P Nørgaard, I Hvid

  • 1Biomechanics Laboratory, Department of Orthopaedic Surgery, Aarhus University Hospital, Denmark.

Journal of Biomechanics
|January 1, 1991
PubMed
Summary

Human trabecular bone strength and stiffness increase with higher strain rates and density. Ultimate strain is mainly affected by strain rate, not density. These findings are crucial for understanding bone mechanics.

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Area of Science:

  • Biomechanics
  • Orthopedic Research
  • Materials Science

Background:

  • Human trabecular bone mechanical properties are critical for skeletal integrity.
  • Understanding the influence of strain rate and apparent density is essential for accurate bone modeling and failure prediction.

Purpose of the Study:

  • To investigate the effects of strain rate and apparent density on stiffness, strength, and ultimate strain of human trabecular bone.
  • To establish quantitative relationships between these mechanical properties and influencing factors.

Main Methods:

  • Uniaxial compression testing of 60 human proximal tibia trabecular bone specimens.
  • Testing across six strain rates (0.0001 to 10 s⁻¹) and varying apparent densities (0.23–0.59 g cm⁻³).
  • Linear and non-linear regression analyses using various mathematical models.

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Main Results:

  • Bone strength and stiffness showed significant correlations with both strain rate and apparent density.
  • Power function relationships best described the variation of ultimate strain with strain rate.
  • Strength and stiffness were equally well explained by linear, power, and quadratic models concerning apparent density.

Conclusions:

  • Strain rate and apparent density are key determinants of human trabecular bone strength and stiffness.
  • Ultimate strain is primarily strain-rate dependent, with limited influence from apparent density.
  • The study provides valuable data for computational modeling and clinical applications in orthopedics.