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motion of marker based shoulder joint center - reference data?

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  • motion of marker based shoulder joint center - reference data?

    Hallo,

    I have done some work in application of least-squares methods for
    shoulder joint center (SJC) estimation. The estimated SJC I have
    expressed in coordinates of different technical coordinate systems
    (TCS). I have tried some TCS fix to the humerus or fix to the
    clavicle/shouldergirdle. Than I had a look at the motion of the SJC in
    abduction and ante/retroversion. I have expressed the motion as
    displacements to the SJC in a static normal position in ant/post and
    medial/lateral direction. Depending on the TCS I have found
    displacements in medial direction more than 7cm which does not agree to
    my view. I think it is mostly caused by skin motion artefacts. Some TCS
    fix to the humerus, work better that TCS of the clavicle. I can reduce
    the displacements to less than 3cm. But I can not descide which of
    different possible TCS is best for our application because I do not have
    some reference of SJC movement for normal volunteers. I have seen
    different characteristic motions depending on the TCS and I want to
    analyse which of the characteristics is real motion and which are
    artefacts.

    It will be very helpful if somebody can send me some reference data or
    references about SJC motion. I do not know if there are other non marker
    based methods used to determane the motion of the SJC while abduction or
    ante/retroversion. If so, this would be very intersting for me to
    compare. But I am also interested in comparisons with the data of other



    Best regards
    Oliver Rettig

    _________________________________________
    Oliver Rettig
    Dept. of Orthopaedic Surgery (Gaitlab)
    Orthopaedic Clinic of Heidelberg
    Schliebacher Landstr. 200A
    69118, Heidelberg
    Germany
    Fax +49(0)6221-966725

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