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Re: Locating Tibialis Anterior tendon's action line using MRI

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  • Re: Locating Tibialis Anterior tendon's action line using MRI

    I believe the problem you are encountering is due to the fact that that
    action of tibialis anterior is oblique to the anatomical reference
    planes. You are forcing the measurement of muscle activity to occur
    along an artificial, and arbitrary, geometry. Inasmuch as tibialis
    anterior is primarily a foot inverter, I doubt that you would ever be
    able to obtain realistic and meaningful measured values if your
    perspective is limited to the sagittal plane.

    Thomas M. Greiner, Ph.D.
    Anatomist and Physical Anthropologist
    Dept. of Health Professions
    University of Wisconsin - La Crosse
    1725 State Street
    La Crosse, WI 54601 USA

    -----Original Message-----
    From: * Biomechanics and Movement Science listserver
    [mailto:BIOMCH-L@NIC.SURFNET.NL] On Behalf Of Stuart Miller
    Sent: Wednesday, May 07, 2008 9:10 AM
    Subject: [BIOMCH-L] Locating Tibialis Anterior tendon's action line
    using MRI

    Hello all,

    My colleagues and I have recently started to calculate the moment arm of
    the tibialis anterior and Achilles tendon. The method we are using is
    the Reuleaux graphical analysis. The images of the ankle are collected
    using MRI techniques. The images are collected in the sagittal plane.
    This technique has been described in Maganaris et al. (1999); Clinical
    Biomechanics 14 pp661-666.

    The problem we are experiencing is of locating the action line of the
    tibialis anterior. The tibialis anterior tendon crosses the sagittal
    plane, so only an oval cross-section can be seen. This does not appear
    enough to accurately locate the action line of the tendon.

    I am wondering if anyone has experienced this problem whilst using this
    technique, and if so, can suggest any solutions.

    The action line of the Achilles tendon is easy to see as it acts along
    the sagittal plane.

    I will forward a summary of the responses in a few weeks.

    Thank you in advance.

    Stuart C. Miller BSc. (Hons)

    Centre for Sports Medicine and Human Performance

    Brunel University



    UB8 3PH