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Modeling of the trunk

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  • Modeling of the trunk

    I am a PhD student at the U. of Sherbrooke (Quebec, Canada) and we
    are trying to validate our dynamic 3D multisegment model. We are
    comparing the results of 2 dynamic methods to estimate triaxial net
    reaction moments at the L5/S1 joint (upward and downward methods)
    depending of the initiation of hte external forces (from the feet or
    from the hands).
    Our results with static tasks suggest that the positions of the
    centers of mass of the different parts of the trunk (pelvic, lumbar
    and thoracic sections) are inadequate. We use the data of Zatsiorsky
    & Seluyanov (1981, 1983) to estimate their positions along the
    longitudinal axis but their antero-posterior positions are unknown.
    We tried to locate these centers of mass along a line connecting the
    middle of the shoulders to the middle of the hips but the results are
    still disapointing.
    We would like to find other body segment parameters data who
    gives the antero-posterior positions for these 3 separate segments.
    We don't know if these data exist. Any comments/suggestions or
    references will be grateffully received.
    As usual, all the responses will be posted. Thank you!

    Christian Lariviere

    Laboratoire de biomecanique occupationnelle
    U. de Sherbrooke
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