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Related Experiment Videos

Compressive axial strain distributions in cancellous bone specimens.

A Odgaard1, I Hvid, F Linde

  • 1Biomechanics Laboratory, Orthopaedics Hospital, University of Aarhus, Denmark.

Journal of Biomechanics
|January 1, 1989
PubMed
Summary

Trabecular bone exhibits significant strain inhomogeneity during compression, with conventional measurements underestimating stiffness and failure strain due to unreliability in capturing local bone deformation.

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Area of Science:

  • Biomechanics
  • Biomaterials Science
  • Orthopedic Research

Background:

  • Trabecular bone mechanics are critical for skeletal integrity.
  • Understanding compressive axial strain distribution is essential for accurate bone strength assessment.
  • Conventional measurement methods may not fully capture the complex deformation of trabecular bone.

Purpose of the Study:

  • To investigate the compressive axial strain distribution in cylindrical trabecular bone specimens.
  • To analyze strain inhomogeneity in relation to failure modes (transverse vs. oblique collapses).
  • To evaluate the reliability of conventional stiffness and strain measurements in trabecular bone.

Main Methods:

  • Cylindrical trabecular bone specimens were subjected to compressive axial strain at a rate of 0.00015 s-1.

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  • Digitized images of specimen surfaces were captured at various strain levels (0-10%).
  • Local axial strain was measured in different thirds of the specimens, differentiating between failure types.

    • Main Results:

    • Axial strain inhomogeneity was observed in both pre-failure and post-failure phases.
    • The intermediate third of the bone was strained less than the ends before failure.
    • Conventional measurements tend to underestimate stiffness and failure strain due to strain inhomogeneity.

    Conclusions:

    • Trabecular bone exhibits significant local strain variations, challenging conventional measurement techniques.
    • Lack of trabecular constraint at end surfaces likely contributes to measurement unreliability.
    • Further research is needed to develop more accurate methods for assessing trabecular bone mechanical properties.