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Re: Dynamics ond kinematics of plantar foot structures

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  • Re: Dynamics ond kinematics of plantar foot structures

    Regarding Harald Bvhm's posting, one article to look at is "Dynamic function
    of medial foot arch" (J. Kayano, 1986, J. Japanese Orthopedic Association,
    60, 1147-1156).

    This study utilized an "electro arch gage" which basically consisted of two
    thin rods connected by a leaf spring. As the rods move towards aeach other,
    they increase the curvature of the leaf spring. This defromation is then measured
    using a strain gage that is mounted on the leaf spring. In practice, one end of
    the distal rod is attached to the skin on the medial side of the first metatarsal head,
    and the proximal end of the proximal rod is attached to the skin on the medial
    aspect of the calcaneus. (The article gives pictures of the device.)

    The author reports that the medial arch stretched rapidly just after heel strike and
    became longest at the early period of the foot-flat phase. The degree of change
    in the length of the arch ranged from 3.7 mm to 9.5 mm, with the mean value being
    6.3 mm.

    As a footnote (excuse the pun), some work done in my lab suggests that the
    amount of stretch in the plantar aponeurosis profoundly affects the stress distribution
    in the plantar fat pad. The reason is that as the aponeurosis is stretched, it becomes
    increasingly stiff (in a non-linear manner) and as a consequence the fatty tissue gets
    "sandwiched" between the ground and the stiffened plantar aponeurosis. If anyone
    has looked into this issue, I would appreciate their comments/insight.

    Regards, Brian

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