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Related Experiment Videos

In vivo bone strain and bone functional adaptation.

Brigitte Demes1

  • 1Department of Anatomical Sciences, Stony Brook University, Stony Brook, NY 11794-8081, USA. bdemes@ms.cc.sunysb.edu

American Journal of Physical Anthropology
|March 3, 2007
PubMed
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Bone shape optimization assumes maximum resistance, but recent studies show long bones don't always bend for maximum resistance. This research clarifies how to accurately predict bone loading from strain data, even with asymmetric bending.

Area of Science:

  • Biomechanics
  • Paleoanthropology
  • Skeletal Biology

Background:

  • Bone cross-sectional shapes are often interpreted through shape optimization, assuming maximum mechanical resistance with minimal material.
  • Recent in vivo strain studies have challenged this by showing long bones may not bend in planes of maximum resistance.

Purpose of the Study:

  • To evaluate the validity of strain measurements for predicting bone loading under different scenarios.
  • To address limitations in previous in vivo studies and clarify the relationship between bone shape, loading, and material usage.

Main Methods:

  • Analysis of two loading scenarios: asymmetric bending and buckling.
  • Mathematical correction for asymmetric bending in bones with directional differences in principal area moments.

Related Experiment Videos

  • Evaluation of the relevance of buckling for primate long bones.

    • Main Results:

    • Asymmetric bending and buckling scenarios can lead to inaccurate load predictions from strain data.
    • Buckling is of limited relevance for the mechanical loading of many primate long bones.
    • Mathematical corrections enable reliable extrapolation of loads from strain measurements, even with asymmetric bending.

    Conclusions:

    • The widely held view that circular bone cross-sections make loading unpredictable (based on buckling models) is challenged.
    • Loads can be reliably extrapolated from strain data when appropriate corrections for asymmetric bending are applied.
    • Further in vivo strain studies are crucial for understanding the link between physical activities, bone loading, and skeletal morphology.