Navicular drop + navicular drift = planal dominance?

I get what your saying that the Calc. can be inclined from the frontal, transverse and Sagittal planes, and the calc. will move in these body planes and be inclined from them at certain stages of the gait cycle.

But if I said to you blah blah blah inclination angle of the calc. was x degrees, I assume you would be thinking Sagittal plane and if we discussing calc position in the frontal or transverse I would use abducted adducted or inverted everted .

 

Many years ago, I heard Root disciples describe this as a function of an orthotic. However, that gets into thorny issues like the definition of control and where do you apply the forces to prevent plantar flexion of the calcaneus. You also have to remember there is soft tissue between the skin and the anterior part of the calcaneus that will dampen forces and hurt in doing so.

To some extent, I believe the arch support works by shifting weight posteriorly from the metatarsal heads. This reduces the lever arm that the ground has to dorsiflex the forefoot on the rearfoot.

The medial heel skive applies forces to a place where forces can be tolerated easily

Eric

 

Hi, Ian could you send me a copy please?
Thanks