Post by robertisaacs on Nov 27, 2008 12:32:23 GMT
Transplanted from General
Dawn Bacon Said
Dear All,
New to the forum (first post, so be gentle folks!).
Bad Bel Said
Dawn Bacon Said
Dear All,
New to the forum (first post, so be gentle folks!).
If the interdigital HM is due to the 5th toe "burrowing" into the lateral aspect of the 4th I usually approach the problem from a biomechanical view. An assessment of foot function and footwear may well prove fruitful. Often excessive sub-talar joint pronation can compromise the quadratus plantae function - effectively resulting in an adducto-varus "pull" on the lesser digits (particularly 4 and 5).
Hope this helps
D
Hope this helps
D
Hey dawn
Now you're talking my language! Welcome indeed!
Quadratus Plantae is a muscle to which not enough attention is paid. Definitly the unsung hero of the foot musculature.
Pause for everyone to check their anatomy textbook and remind themselves where and what it is . This might help
en.wikipedia.org/wiki/Image:Gray444.png#filelinks
I would wholeheartedly agree that the angle of pull on the digits is strongly infulenced by the morphology / function of the foot . The actual effect of QP is a mare to assess, its deep and hard to examine without imaging equipment.
However try this for a chain of deductive reasoning.
The FDL muscle run just inferior to the medial malleolus and Superior to the Tibialis posterior.
In a foot which is pronated (at any given moment) this structure deviates medially especially in a foot with a transverse dominance (drift lots drop little)
This increases the angle of the force of the fDL relative to the midline of the foot.
The QP, whose function it is to alter the vector of force would have no work to do in a foot where the flexor pulled paralell to the midline.
As the angle increases the requirements on it increase concordantly
Therefore, the requirements on the QP is proportionate to the degree of pronation (specifically the lateral deviation element of it) multiplied by the amount of flexor activity.
Of course any such chain of logic is subject to flaws, however it raises some ineresting questions does it not? This muscle is not present in everybody, it would be fascinating to compare foot morphology between those who have it and those who do not!
Might have to transplant this to biomechanics.
Regards
Robert
Quote:Often excessive sub-talar joint pronation can compromise the quadratus plantae function - effectively resulting in an adducto-varus "pull" on the lesser digits (particularly 4 and 5).
Now you're talking my language! Welcome indeed!
Quadratus Plantae is a muscle to which not enough attention is paid. Definitly the unsung hero of the foot musculature.
Pause for everyone to check their anatomy textbook and remind themselves where and what it is . This might help
en.wikipedia.org/wiki/Image:Gray444.png#filelinks
I would wholeheartedly agree that the angle of pull on the digits is strongly infulenced by the morphology / function of the foot . The actual effect of QP is a mare to assess, its deep and hard to examine without imaging equipment.
However try this for a chain of deductive reasoning.
The FDL muscle run just inferior to the medial malleolus and Superior to the Tibialis posterior.
In a foot which is pronated (at any given moment) this structure deviates medially especially in a foot with a transverse dominance (drift lots drop little)
This increases the angle of the force of the fDL relative to the midline of the foot.
The QP, whose function it is to alter the vector of force would have no work to do in a foot where the flexor pulled paralell to the midline.
As the angle increases the requirements on it increase concordantly
Therefore, the requirements on the QP is proportionate to the degree of pronation (specifically the lateral deviation element of it) multiplied by the amount of flexor activity.
Of course any such chain of logic is subject to flaws, however it raises some ineresting questions does it not? This muscle is not present in everybody, it would be fascinating to compare foot morphology between those who have it and those who do not!
Might have to transplant this to biomechanics.
Regards
Robert
Bad Bel Said
Ok, all that`s logical (and actually very interesting i hate to admit), but HOW could we compare morphology between those with a QP and those who don`t? Is there a clinical assesment that can be utilised to first see if it is present?