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Does microdamage accumulation affect the mechanical properties of bone?

D B Burr1, C H Turner, P Naick

  • 1Department of Anatomy, Indiana University School of Medicine, Indianapolis 46202, USA. dburr@iupui.edu

Journal of Biomechanics
|July 22, 1998
PubMed
Summary
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Microcrack accumulation in bone impairs mechanical properties, reducing elastic modulus. Damage accumulates faster in tensile bone regions, while cracks grow larger in compressive areas.

Area of Science:

  • Biomechanics
  • Skeletal Biology
  • Materials Science

Background:

  • The relationship between microdamage accumulation and bone mechanical properties remains unclear.
  • Previous studies have not definitively shown that microcracks impair bone function.

Purpose of the Study:

  • To investigate the correlation between microdamage accumulation and reduced bone elastic modulus.
  • To determine if microdamage accumulates faster in tensile cortices and grows larger in compressive cortices.

Main Methods:

  • Canine femurs underwent cyclic bending tests to induce varying degrees of stiffness loss.
  • Microdamage was quantified using basic fuchsin staining and microscopic analysis.
  • Crack density, length, and damaged area were measured.

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Main Results:

  • Significant microdamage was observed only after a 15% loss in elastic modulus.
  • A linear relationship was found between the percentage of damaged area and stiffness loss.
  • Microcracks were more numerous in tensile cortices but longer in compressive cortices.

Conclusions:

  • Microcrack accumulation demonstrably impairs bone mechanical properties by reducing elastic modulus.
  • Bone damage kinetics differ between tensile (faster accumulation) and compressive (greater crack growth) regions.