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    Re: Foot stiffness and footwear

    In summary then , the transverse arch can be viewed as being composed of five saggital sections ,each of which corresponds to a metatarsal and a component of the transverse arch of the tarsals . Each of these sections is further composed of ligaments and by a component of the plantar fascia ( overall , the foot can be thought of as having five longitudinal arches each composed of a metatarsal ,tarsal arch , calcaneus and talus supported by ligaments and the plantar fascia )

    The most medial of the saggital sections ( which is a part of the medial longitudinal arch ) is composed of tarsal arch ,the first metatarsal ,ligaments and the plantar fascia .

    So we have five metatarsals in the transverse arch ,which are in turn united by common proximal and distal sites of attachment (tarsal arch and transverse ligament -see previous post ) .

    During later stance the existence of a "metatarsal parabola " causes the metatarsals to give rise to a distally placed transverse arch which ,when taken as together with the rest of the transverse arch , provides the necessary stiffness for this phase of gait .

    I have omitted the intrinsic foot muscles from the system because increasingly I see their role (other than helping to control toe movement ) as being pivotal in maintaining the transverse arch of the foot during later stance . However they do this not primarily by resisting body weight but rather by controlling the configuration of the transverse arch . That is they make adjustments to the bony/ligamentous framework of the foot and this framework ,aided by the extrinsic foot muscles , supports the body during gait . (see PO Mckeon et al above post 3 ) .

    If all of the above is true then weak or " under educated " intrinsics will eventually lead to major problems with the entire system leading perhaps to more proximal tissue failure .

    If this is all starting to look like very similar Mckenzies " half dome" and Mckeons (1) "foot core " expansion of the same , then that is because I think both ideas are valid since the existence of a metatarsal parabola would extend the half dome into the forefoot when foot stiffness is most required .


    Any thoughts ?
    Gerry
    (1)The foot core system: a new paradigm for understanding intrinsic foot ...

    bjsm.bmj.com › Archive › Volume 49, Issue 5
    by PO McKeon - ‎2015 - ‎Cited by 63 - ‎Related articles
    We then integrate the concept of the foot core into the assessment and treatment of the foot. Finally, we call for an increased awareness of the importance of the ...
    Last edited by Gerrard Farrell; 07-17-2017 at 12:15 PM. Reason: clarity

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