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Determining Joint Centers (was Re: upper torso modelling)

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  • Determining Joint Centers (was Re: upper torso modelling)

    Rather than estimate the positions of the joint centers from
    anatomical landmarks, use the marker motions to estimate the
    positions of the joint centers. I would suggest looking at this recent
    O'Brien, J. F., Bodenheimer, B. E., Brostow, G. J., Hodgins, J. K.,
    "Automatic Joint Parameter Estimation from Magnetic Motion Capture
    Data." Proceedings of Graphics Interface 2000, Montreal, Quebec,
    Canada, May 15-17, pp. 53-60.

    A copy of the paper can be downloaded from

    Adrian Morphett writes:
    >I am seeking information on modeling the upper limbs of the human body. I
    >have an Ascension Flock of Birds and wish to use it to record human motion.
    >I am having difficulty in accurately determining the location of joint
    >centres and the axis of rotation. Specifically, I am looking at the cervical
    >spine, the shoulder, the elbow and the wrist.
    >I have ample literature on how these joints work, the rotation axis and how
    >these axis were determined. I cannot however find information on relating
    >these joint centres to known anatomical locations. Is there some standard
    >that is used in biomechanics laboratories for linking motion capture data to
    >specific joint angles? For instance, measure known anatomical locations
    >which will estimate the joint centres, use this data as offsets to the
    >sensor locations and then you have the joint centres in relation to the
    >sensor. With this information, the joint angles can be determined from the
    >sensor data (I hope!). Or another example: measure anatomical locations on
    >the shoulder complex and elbow and determine the long axis of the humerus -
    >can this be done?

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