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Confusion with knee and ankle width measurements in ViconWorkstation

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  • Confusion with knee and ankle width measurements in ViconWorkstation

    We at the motion lab at Childrens Hospital L.A. are noticing issues in Vicon
    Workstation regarding knee and ankle width measurements in "Subject
    Measurements" effecting calculated joint centers of the knees and ankles in
    an unpredictable way. We are having a hard time finding a definite pattern,
    but sometimes changing a measurement after static processing, say left knee
    width, followed by reprocessing, we notice any one of the following: the
    left ankle joint center is affected, the opposite knee joint center is
    affected, both ankle joint centers are affected, nothing is affected, or the
    correct joint center is affected.

    The stick figure in workspace as well as exported 3-d data reflect these
    behaviors. Reconstructing between static reprocessing, saving, reloading
    processed data, and opening and closing trials all seem to have an affect on
    the outcome of which ankle joint centers are affected by which measurements,
    but the exact pattern does reveal itself to us.

    In any case, if anyone has experience with the matter and can comment, we
    would much appreciate your input.

    Greg Stanczak
    Childrens Hospital of Los Angeles