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A method for measuring external spinal loads during unconstrained free-dynamic lifting

F A Fathallah1, W S Marras, M Parnianpour

  • 1Biodynamics Laboratory, Ohio State University, Columbus, USA.

Journal of Biomechanics
|September 26, 1997
PubMed
Summary
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This study introduces a new, accurate method for measuring trunk moments and forces during lifting. The technique uses a force plate and electrogoniometers, offering a non-restrictive way to assess spinal loading.

Area of Science:

  • Biomechanics
  • Human movement analysis
  • Occupational safety

Background:

  • Biomechanical lifting models require trunk kinetic data for validation and joint loading assessment.
  • Obtaining dynamic trunk kinetic data is challenging due to motion constraints and assumptions.

Purpose of the Study:

  • To present a novel technique for continuous 3D force and moment determination at the L5/S1 spinal joint.
  • To validate this technique and evaluate its applicability in lifting scenarios.

Main Methods:

  • Utilized a combination of a force plate and two electrogoniometers to measure trunk kinetics.
  • Developed and validated an apparatus to compare actual applied moments with predicted moments.

Main Results:

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  • The technique demonstrated an average percent error of approximately 4% in estimating applied moments.
  • Achieved high test-retest reliability, approaching unity.
  • The method proved effective across various tested conditions.

    • Conclusions:

    • The developed technique provides a highly accurate and reliable measure of trunk moments at L5/S1.
    • This approach is applicable to most lifting conditions without restricting body joint motion.
    • Offers a practical solution for obtaining crucial biomechanical data in occupational settings.