> Sorry, this is not conjecture, but simple physics. I was being
> scientifically pedantic. Generation of a moment is the result of a force.
> Passive tissues may transmit tensions or forces, but they do not
'generate'
> forces. Either the muscle directly produces a moment about a fulcrum OR
a
> moment is produced by one of the following:
>
> 1. Another muscle that is not directly associated at all with the joint
or
> tissues concerned,
> 2. Another action like a fall or landing after propulsion from another
limb
> 3. Gravity acting on a given system.
>
> Whatever the case may be, there has to be a primary force present
somewhere
> to produce the action about the given fulcrum. Fasciae do not 'produce'
> forces.
Highly pedantic ;-) I should perhaps have used the terms "transmit" and
"modify", and in this light I should modify my conjecture that it is the
plantar fascia which has a transmission effect in re-supinating the STJ, for
without it dorsiflexion of the toes would have little to no effect on the
supination moment produced about the STJ axis. However, if we follow your
line of argument, we could say that it is the earth's mass and rotational
velocity which ultimately determines and generates external moment about the
STJ axis, and while this may be true, it doesn't help us much clinically; so
while we may split hairs, we have come no closer to determining the
pathogenesis of plantar fasciitis. I should be interested to here your
thoughts as to what you believe to be the primary pathogenic mechanism of
plantar fasciitis is and as to how you approach the Tx of this condition?
Best wishes,
Simon
**************************************************
Simon K. Spooner PhD, BSc, SRCh
Lecturer Biomechanics
Plymouth School of Podiatry
North Road West
Plymouth, UK
PL1 5BY
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