Dear Eric
In the normal foot.
The locking of the navicular middle cunieform bones occurs just after
midstance as the heel has comenced to lift from the ground
the talus moves forward and medially is a screw like manner as well as an
eversion manner
this locks the mid cunieform bone
thus allows the calcaneal navicular ligament to tend to pull the foot in a
medial and pronation directions.
The action of the posterior tibial muscle hyperarches these joints
(hyperflexes), in other words pulls these joints together (producing a
bowing action) to stop them collasing under the changed joint motion and
pressure.
or acts by producing a bowing motion to stop the arch from collapsing as
the weight of the body translate forward and forces begin to head for the
base of the great toe ready for toe off.
Here the great accelerating FLH comes into its action of putting a spring
into ones step.
Lock? Broken?
There is a standing foot and an everything else foot. As I have stated
elsewhere the standing foot is the calcaneous, cuboid and toes 4 and 5.
This is why when we walk we intially go to the standing foot in
anticipation of stopping, the normal thing to do. Thus patients with
painful feet on walking are walking on their standing foot.
Since we are walking we move to our walking,climbing,running foot.
Thus we need to break the standing foots position and move to the walking
etc. foot. This is what I mean by breaking this lock.
Hopefully i have cleared up a few things.
Regards,
Paul Conneely.
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