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  • Summary of Responses to Move3D posting

    Earlier this week I posted a request for help with developing a Move3D
    model and said I would post responses. I received a number of
    responses, mostly directing me to VICON's Bodybuilder software which
    would allow me to build a model, or alter an existing model to input
    the specific inertial properties for the prosthetic limbs I am
    studying. Below are the responses I received. Thank you to everyone who
    responded, your comments have been very helpful.
    Sincerely,
    Chrissy Boyda

    ************************************************** *****************
    I don't have a direct answer for your subject, but the following
    information is in the
    C-Motion's web site:

    >

    Thus, perhaps the C-Motion's support service can aid in your research.
    Best Regards,

    Wagner de Godoy
    Brazil

    ************************************************** *****************
    Can you not change the leg inertial parameters in VICON's BodyBuilder?
    Then
    you would not need to use Move3D. We are using this method to modify
    the
    segment masses and inertial parameters for paraplegics.

    Brian Schulz, Ph.D.
    Program Specialist
    VISN 8 Patient Safety Research Center (118M)
    James A. Haley Veterans' Hospital
    11605 North Nebraska Ave.
    Tampa, FL 33612-5738
    Phone: (813) 558-3944
    Fax: (813) 558-3990
    www.patientsafetycenter.com
    ************************************************** *****************
    Hi Chrissy,
    You may have some luck on the c3d website - it's www.c3d.org. It's for
    documentation/programs for the .c3d file type.
    Jen Baird, PT
    Christine:

    I am not positive but I recall reading something in a Vicon manual
    about dealing with the situation of a prosthetic limb. I think there
    is a way to enter the inertial properties of the limb and have Vicon
    software calculate the correct net forces and moments. It would be
    worth giving them a call to find out.

    Jeremy
    ************************************************** **********************
    Hi Christine,
    By "standard" Vicon marker set, do you mean the Helen Hayes or CGM
    marker set ie., RASI, LASI, SACR, LTHI, LKNE, LTIB, LANK, LTOE (+ right
    side)? If that is the case it may be difficult to build a model in
    Move3D.
    You will have to manipulate the C3D files and create physical markers
    for
    the Hip center, knee center, and ankle center and use these for
    tracking.
    This will give you a 3dof model using 3 markers to track each segment.
    Move3D needs a minimum of 3 physical markers to track each segment.
    Let me
    know if this helps.

    Sincerely,

    Michael Rainbow
    Michael Rainbow, B.S.
    Motion Analysis Laboratory
    Shriners Hospital for Children
    1645 West 8th Street, Erie, PA, 16505, USA
    814)875-8806 voice, (814)875-8756 fax
    mrainbow@shrinenet.org
    http://www.shrinershq.org/research/erie/
    ************************************************** *****************Hi
    Christine
    Just read your question on BIOMCH-L question and thought I could lend a
    hand. Inertial properties of segments can be changed in bodybuilder
    models. What marker set do you use for your research. Is it the Plug
    In Gait markers set (our standard set) or are you using your own marker
    set. If you are using Plug In Gait.mkr you can run a one of our full
    body models call “Golem.mod”. This model is almost identical to the
    Plug In Gait model with exception that it is an open model that you can
    modify (Plug In Gait is a closed model due to validation).
    I’m attaching a Word document out of our BodyBuilder course manual that
    covers the definition of segment inertial properties. If you want to
    adjust the inertial properties of one of legs you would open the Golem
    model and look at the bottom and you will find a heading for “Kinetics”
    where you can set the properties. Have a look, and if you need any
    more help just let me know.
    Cheers
    Derek Potter
    Support Engineer
    Vicon Motion Systems
    ************************************************** **********************
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