The Rigid Flat Foot: Do you know what you are actually dealing with ?
Normally we need to have just slightly greater than 90 degrees of ankle mortise dorsiflexion to progress the body over the ankle. Put in other words, we need to be able to get the tibia slightly past vertical (perpendicular to the ground, hence 90+ degrees). Depending on the reference, anywhere from 15-25 degrees past that 90 degree vertical, thus 105 to 120 degrees) is the goal.
*So, a flat RIGID foot. If you jam an agressive orthotic (or possibly even a motion control shoe) under this foot it could very likely be painful to those rigid bony prominences and it will remove the client’s “passing the buck” compensation. Now the forces may have to revert to the proximal strategy at the knee. So, when do YOU go with the orthotic or motion control shoe ? When it comes to the feet, use your head. And, consider the Gait Guys, National Shoe Fit DVD program. Email us at : firstname.lastname@example.org