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co-ordinate axes and rotations for 3-D

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  • co-ordinate axes and rotations for 3-D

    Dear readers,

    My students and I study the biomechanics of cervical spine trauma. We
    have just implemented an algorithm, based on Herman Woltring's
    software, to calculate Euler angles using an xyz convention from
    biplanar high speed video data.

    This has raised the question of the orientation of the co-ordinate axes
    relative to the spine, and the order of the rotations. There are
    different practices used by the various groups (automotive, aerospace,
    orthopaedic, etc.), and this has raised a number of questions as to the
    best choice.

    Is there a consensus opinion or standard on this subject?

    Given that axial rotation and lateral bending are strongly coupled
    rotations, while, flexion-extension rotation is relatively uncoupled,
    is there a prefered order of coordinate rotations? Is the selection of
    any real consequence in this particular problem?


    Any thoughts would be greatly appreciated.


    Sincerely,

    Barry Myers
    bsm@occiput.egr.duke.edu
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