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Related Experiment Videos

Microstrain fields for cortical bone in uniaxial tension: optical analysis method.

D G Kim1, J B Brunski, D P Nicolella

  • 1Department of Mechanical Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA. kim@bjc.hfh.edu

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|April 12, 2005
PubMed
Summary

Researchers used machine vision photogrammetry (DISMAP) to measure bone strain. Local bone strain around microstructural features was significantly higher than global strain under tension.

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Area of Science:

  • Biomechanics
  • Materials Science
  • Orthopedics

Background:

  • Cortical bone exhibits complex mechanical behavior under tensile stress.
  • Understanding local strain distribution is crucial for predicting bone fracture.
  • Previous methods often lack the resolution to capture micro-scale strain variations.

Purpose of the Study:

  • To quantify global and local strain fields in cortical bone using an advanced optical method.
  • To investigate the relationship between applied tensile stress and local strain concentrations.
  • To compare local strain gradients with overall specimen strain.

Main Methods:

  • Employed microdisplacements by machine vision photogrammetry (DISMAP) for optical strain measurement.
  • Utilized microtensile specimens of cortical bone under controlled uniaxial tension.

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  • Measured local maximum principal strains within the gauge region as a function of applied stress.

    • Main Results:

    • A strong linear correlation was observed between global strain and increasing tensile stress (r2 = 0.98).
    • High gradients of local strain were identified around microstructural features in stressed bone.
    • Local strains at microstructural features were 11.5-79.5 times greater than the global strain.

    Conclusions:

    • DISMAP effectively captures localized strain variations in cortical bone.
    • Microstructural features significantly concentrate strain, leading to higher local stress levels.
    • These findings have implications for understanding bone fragility and failure mechanisms.