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ISB kinematics convention

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  • ISB kinematics convention

    It is very interesting to read the discussion on the ISB kinematics
    convention in the list.

    Although I agree that this ISB standardized kinematics convention should
    follow the international standards and commonly accepted practices in
    physics and mechanics, I don't think how to labelling axes is a very
    important issue in this business. The purpose of standardizing
    kinematics convention should be well justified first.

    Why should the convention be standardized? For the convenience of
    sharing data? I don't think this is a good argument for this
    standardization. It should not be a problem to transfer data from one
    coordinate system to another as long as the definitions of both system
    are clearly described. Besides, how many biomechanics research groups
    are sharing data? If it is not a common practice, why should all people
    in biomechanics use the same system for the convenience of a small group
    of people?

    It may be a good argument that this standardization will make the
    description of the coordinate system easier in publicatins and
    thus help to shorten the lengths of those papers for journals. If this
    is the main purpose of this standardization, more than one definition
    should be recommended for the convenience of majority, if not all, in
    biomechanics research community. In the technical note by Wu and
    Cavanaph, only one rotation order was recommended without any
    justification for the use of this rotation order. This really concerned
    me. It is known that there are many different rotation orders and the
    results of rotation could be quite different for different rotation
    orders. A given order of rotation may have some advantages for some
    joints in some research work but may not for the other. I do think that
    the order of rotation should not be standardized or multiple standards
    should be recommended.

    This standardization may be more complicated than it was thought. ISB
    may need further considerations before any recommendations are made.

    Bing Yu, Ph.D.
    Orthopedic Biomechanics Laboratory
    Mayo Clinic
    Rochester, MN 55905