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  • Measuring tissue displacements using "gait" analysis systems

    Greetings.

    I am looking for an automated system for measuring tissue displacements
    during mechanical testing. The first application of this will be to measure
    linear displacement at several points (to be converted to a 1D strain field)
    of tendons during ex vivo tension testing. I am soliciting comments and
    sage advice from individuals who have experience in using "gait analysis"
    systems to measure tissue motions during mechanical tests, or from anyone
    who has developed a successful "in house" method for doing this. After
    reviewing some of the literature, I am inclined toward using a video-based,
    single camera system with high contrast markers attached at several places
    along the tendon. I am looking for software solutions for tracking marker
    positions "automatically".

    I have looked into a Motion Analysis Corp. HiRES system (PC-based, single
    camera, $39,000) after seeing a Motion Analysis system at the Mayo Clinic
    used for tendon testing, and also because the gait lab on campus here uses
    one of their 6 camera systems (alas, borrowing their system is not an option).
    The cost of the HiRES system inspired me to see what other options might
    be out there.

    I would appreciate hearing comments and suggestions from those of you
    who have used Motion Analysis or other "gait" systems to measure tissue
    displacements. We will not use the system to measure gait/locomotion,
    but will probably use it in a variety of tests on soft and hard tissues.
    Are gait systems worth the cost? Are there other, lower cost but equally
    versatile alternatives?

    Thanks for any comments.

    Matt Silva
    Orthopaedic Research Lab
    Washington University St. Louis, MO
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