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marker attachment method

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  • marker attachment method

    In order to view calcaneal motion inside shoes during walking I'm
    attempting to use a technique I first viewed at University of North
    Carolina Chapel Hill. I've bent a flat sheet of heat formable plastic
    into a "U" shape, and then formed one side of that "U" around the
    subjects calcaneus (medial, lateral, and posterior). The other side of
    the "U" has three reflective markers attached. When the subjects foot
    is inside a shoe with the mold attached to the calcaneus, the markers
    are visible externally for 3D motion analysis. Those familiar with foot
    studies understand this is an attempt to study calcaneal motion and
    avoid the controversy related to markers on shoes or cutting shoes to
    view direct calcaneal markers.

    My problem is this: I have not yet found a tape that works sufficiently
    well for the duration of the trials I am contemplating. In addition it
    is necessary for my subjects to remove their shoes to have foot
    orthotics installed halfway through the trials. During each test trial
    conducted to this point, the tape has always come off when the subject
    is slipping their foot back into shoes.

    I could resolve the problem by simply reattaching the mold and taking
    another neutral trial, but that introduces data analysis problems. So I
    am open to suggestions for attachment methods. Maybe a glue that is
    easily removed from the skin?

    Thank you for any suggestions!

    Louis B. Rosenfeld
    Candidate for MSc. University of Calgary

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