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Related Experiment Videos

Calculation of tibial loading using strain gauges.

James R Funk1, Jeff R Crandall

  • 1Biodynamic Research Corporation, 5711 University Heights Blvd., Suite 100, San Antonio, TX 78249, USA.

Biomedical Sciences Instrumentation
|July 5, 2006
PubMed
Summary
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Strain gauges can measure bone bending moments accurately but struggle with axial loads in long bones. Adjusting the centroid calculation improves accuracy for these biomechanical load measurements.

Area of Science:

  • Biomechanics
  • Orthopedic research
  • Biomedical engineering

Background:

  • In situ load cells alter bone properties during measurement.
  • Strain gauges offer a non-invasive alternative for measuring bone loading.
  • Accurate assessment of bone loading is crucial for understanding injury mechanisms and implant design.

Purpose of the Study:

  • To evaluate the efficacy of using strain gauges and linear beam theory to measure axial loads and bending moments in cadaveric tibiae.
  • To identify sources of error in the strain gauge method for bone load measurement.
  • To propose corrections for improving the accuracy of axial load calculations.

Main Methods:

  • Three strain gauge rosettes were applied to the midshaft of two cadaveric tibiae.

Related Experiment Videos

  • Specimens underwent quasistatic axial compression and four-point bending tests.
  • Linear beam theory was applied to calculate axial loads and bending moments, considering irregular cross-sections.

    • Main Results:

    • Bending moments were calculated accurately using the strain gauge method.
    • Calculated axial loads exhibited significant errors, up to 50%, attributed to bone curvature and non-ideal material properties.
    • An adjusted "effective" centroid, approximately 1.5 mm from the area centroid, corrected axial load errors.

    Conclusions:

    • The strain gauge method is promising for measuring bending moments in long bones, especially when load cells are impractical.
    • Corrections for axial load calculations, such as using an effective centroid, are necessary for accurate results.
    • This methodology holds potential for biomechanical studies involving straight bones and situations where minimizing invasiveness is key.