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  • Kinematics and Extenders ...

    Biomech-L colleagues:

    Greetings, I have a bit of a motion analysis/kinematics quandary that has
    come up in my experimental work.

    I was wondering if you'd run into problems something like the one I'm
    currently tackling? I am trying to obtain neck angle measurements in pitch
    studies on seated subjects. In order to image the positions of the C2 and
    C7 vertebrae, I mounted plastic extenders on the neck of the test subjects
    using two-sided tape. Have any of you ever worked with such extenders?

    I imaged LEDs mounted on the extenders and found that I couldn't find out a
    method for correcting for the (known) geometry of the extenders without
    assuming a neck "center of rotation". Unfortunately, this center of
    rotation was itself to be determined from our analysis. I have thought of
    performing a sensitivity analysis to determine the extent of asssumed
    variations in neck COR on neck angle using the extender geometry. Have any
    of you dealt with problems like this? Please feel free to write to me if
    this presentation of my difficulty is hard to understand. Thank you in
    advance for your consideration of this matter.

    Sincerely,

    Cheryl Pattin

    Cheryl A. Pattin, Ph.D.
    Research Associate
    Sensory Motor Performance Program Personal phone: (312) 908-7944
    E809 - Room 1406 Department phone: (312) 908-3381
    Rehabilitation Institute of Chicago FAX (312) 908-2208
    345 East Superior Street e-mail: cheryl-ric@nwu.edu
    Chicago, IL 60611
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