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Related Experiment Videos

Tensile damage and its effects on cortical bone.

S P Kotha1, N Guzelsu

  • 1Biomechanics and Biomaterials Laboratory, University of Missouri-Kansas City, 650 E. 25th Street, Kansas City, MO 64108, USA.

Journal of Biomechanics
|October 3, 2003
PubMed
Summary

Bone damage increases organic matrix strain capacity, suggesting shear failure. However, damaged bone tissue shows altered mechanical behavior and a trend towards lower ultimate strains after saline storage.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Research
  • Mechanobiology

Background:

  • Bone's mechanical properties are crucial for skeletal function.
  • Understanding bone damage mechanisms is vital for treating injuries and diseases.
  • The role of the organic matrix in bone's response to damage requires further investigation.

Purpose of the Study:

  • To investigate the effects of induced damage on the mechanical behavior of bovine bone's organic matrix and intact tissue.
  • To compare the mechanical properties of damaged versus non-damaged bone samples.
  • To elucidate the failure mechanisms in damaged bone tissue.

Main Methods:

  • Plexiform bovine bone samples were subjected to tensile loading beyond their yield point to induce damage.
  • Damaged samples were divided into two groups: one stored in saline for viscoelastic recovery, the other decalcified.

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  • Tensile tests were performed on decalcified (organic matrix) and saline-stored (intact tissue) samples to assess mechanical properties.

    • Main Results:

    • Decalcified damaged bone exhibited a 29% higher ultimate strain than control, with similar ultimate stresses and elastic moduli, suggesting organic matrix shear failure.
    • Damaged bone stored in saline showed a trend towards lower ultimate strains compared to controls.
    • Damaged bone tissue displayed a bi-linear mechanical behavior, unlike non-damaged bone, with similar initial elastic modulus and ultimate strength.

    Conclusions:

    • Bone damage may result from shear failure within the organic matrix, involving collagenous components.
    • The mechanical response of intact bone tissue to damage differs significantly from its organic matrix.
    • Further research into bone's complex mechanical behavior under damage is warranted.