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Trunk model

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  • Trunk model

    Dear members,

    I was wondering if anyone might have any advice on two problems I'm having
    attempting to develop a dynamic model of the lumbar spine. First of all,
    although I have estimated the inertial parameters of the different segments
    of the trunk (by assuming elipsoid solids at each level with a fraction of
    the total trunk weight proportional to the height of each vertebral
    section), I have no real way of knowing if they are accurate. I have not
    been able to locate a published copy of inertial parameters of the trunk
    sectioned into levels (or a reasonable lumped parameter model of same) even
    though I know they must have been used in several trunk simulation studies.

    Secondly, I am trying to determine what the MINIMUM trunk muscle set is for
    posture stability. Although I have several papers by McGill, et al. dealing
    with how to apportion activation by optimization to a group of too ANY
    muscles (e.g. 90 ), I haven't been able to locate any information on a
    minimal muscle group system.... Any thoughts would be greatly appreciated.

    Ari Wilkenfeld, PhD
    Cleveland FES Center
    Case Western Reserve University School of Medicine

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