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Neck muscle paths and moment arms are significantly affected by wrapping surface parameters

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  • Bethany Suderman
  • Bala Krishnamoorthy
  • Anita Vasavada

Abstract

In this paper, we studied the effects of wrapping surfaces on muscle paths and moment arms of the neck muscle, semispinalis capitis. Sensitivities to wrapping surface size and the kinematic linkage to vertebral segments were evaluated. Kinematic linkage, but not radius, significantly affected the accuracy of model muscle paths compared to centroid paths from images. Both radius and linkage affected the moment arm significantly. Wrapping surfaces that provided the best match to centroid paths over a range of postures had consistent moment arms. For some wrapping surfaces with poor matches to the centroid path, a kinematic method (tendon excursion) predicted flexion moment arms in certain postures, whereas geometric method (distance to instant centre) predicted extension. This occurred because the muscle lengthened as it wrapped around the surface. This study highlights the sensitivity of moment arms to wrapping surface parameters and the importance of including multiple postures when evaluating muscle paths and moment arm.

Suggested Citation

  • Bethany Suderman & Bala Krishnamoorthy & Anita Vasavada, 2012. "Neck muscle paths and moment arms are significantly affected by wrapping surface parameters," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 15(7), pages 735-744.
    • Handle: RePEc:taf:gcmbxx:v:15:y:2012:i:7:p:735-744
    DOI: 10.1080/10255842.2011.558085
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    Cited by:

    1. Paulien E Roos & Anita Vasavada & Liying Zheng & Xianlian Zhou, 2020. "Neck musculoskeletal model generation through anthropometric scaling," PLOS ONE, Public Library of Science, vol. 15(1), pages 1-21, January.

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