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I posted this in the belgium pod conference thread but should have been a new thread as it doesn't appear to be in there....
I can't remember where the diagram with the frontal plane section through the heel and rear section of an orthosis showing normal (from orthoses surface geometry) force, lateral to medial shear force (from friction from orthosis cover) and resultant ORF is.
Any directions appreciated, mark
I posted this in the belgium pod conference thread but should have been a new thread as it doesn't appear to be in there....
I can't remember where the diagram with the frontal plane section through the heel and rear section of an orthosis showing normal (from orthoses surface geometry) force, lateral to medial shear force (from friction from orthosis cover) and resultant ORF is.
Any directions appreciated, mark
It sounds like one of mine I put up here some time ago, I'll try to find it later.
Thanks Simon, it was the opposing forces to those in the 3rd diagram.
Why I'm after it is related to the 'myth' regarding the COP being medial (or lateral) to TP reflection of STJ axis not necessarily causing a supinatory (or pronatory) moment, the 'line of direction' import.
If there's no movement of the foot (heel slipping laterally) then that means the frictional shear force equals the 'gravitational' vector along the surface of the orthosis. The resultant ORF would be the vector addition of normal force and that frictional shear, yes? How do we determine the magnitude of that shear force? and thus determine the 'line of direction' of ORF, mark
Can't locate diagram
Linear Mode
