Posture Control Insoles(TM) works so well because they are based on a dynamic model of hyperpronation rather than a static model which is the model for traditional orthotics.  The dynamic model incorporates the neuromuscular system.  Dr. Rothbart described hyperpronation as a particular motion of the bones in the foot and ankle.  As weight transfers to the forefoot, the medial arch collapses, the ankle rolls inward and downward.  The leg rotates internally. The collapse of the body foundation, the foot and ankle, in turn affects posture and motion of the entire body.

When a person who hyperpronates positions the foot so the ankle is neutral, neither pronated (leaning in) or supinated (leaning out), the first metatarsal and big toe is not in weight bearing contact with the ground.  The first ray (first metatarsal and big toe) is elevated and slightly rotated.  When  weight is transferred to the forefoot, the first metatarsal and big toe travel a distance downward to become weight bearing.  Place the pointer on the picture to see.  Notice how the motion causes the entire leg to rotate.  Dr. Rothbart is the first to describe this relationship, so we call this foot structure "Rothbart's Foot Structure" (RFS). The fact that people hyperpronate has been commonly accepted for decades,  but nobody seemed to truly understand why.  As it turns out, that answer was given years ago by medical researchers and practitioners in their published descriptions of the development of the fetus as well as studying the bones of the feet of cadavers At eight weeks old, the feet of the fetus are positioned such that the soles of the feet are facing each other. As the fetus develops, the creation and growth of the bones in the lower extremities go through an untwisting process. This untwisting motion also applies to the bones in the foot including the calcaneus (heel), talus (anklebone), the first metatarsal and phalanges. It is documented in the medical literature that this untwisting process stops earlier in some fetuses, later in others, and it leads to a corresponding difference in the deficit (distance) between the big toe and the ground.   Clubfoot deformity defines the extreme case where this uncoiling stops so early that the heel is also deformed.  Based on a 50 year old theory, Roots Biomechanics, it was believed, and many still believe that hyperpronation can be effectively controlled by static arch supports, heel cups and heel shims.  This basically amounts to  building the ground up under the foot while trying to position the foot in an "ideal" position.  If people were more like buildings this would probably work a lot better, but since we aren't, facilitating motion becomes the key to successful stabilization.  Dr. Rothbart, based on his podiatric background and experience, started out fully compensating for the actual (static) elevation of the first metatarsal and big toe, building the ground up to the foot as he had done with arch supports in the past.  But he quickly learned from his patients that he had to rethink his approach in terms of motion.  The patients' center of gravity shifted so far back they became unstable.  Some even became nauseated from the change.  He backed off on the dimensions, and discovered that somehow, the body in its own wisdom picked up the suggestion from a much smaller wedge (post) and amplified it.   Only a third of the static compensation was necessary to achieve a significant reduction in dynamic hyperpronation and re-posturing of the body.  The small stimulus is amplified by muscle action.  Since the small wedge placed underneath the first metatarsal and big toe was too small to have a significant static impact on hyperpronation, Dr. Rothbart became curious about the mechanism that amplified its impact.  

Proprioception is the body's sense of position, direction and motion.  Your body continuously responds to signals from proprioceptors (sensors) in your muscles, joints, on the surface of your skin and under your feet, particularly your forefeet.   Without proprioception, you wouldn't be able to stand and walk.   In effect,  Posture Control Insoles(TM) cause the first metatarsal and big toe to establish ground contact earlier in the gait, which in turn may cause the muscles controlling the first metatarsal to engage earlier in the gait cycle.   The result is significant change in hyperpronation through the full gait cycle from heel strike through toe-off.  Torsional forces in the lower extremities are reduced, the knees move over the feet as they should, and the result is a profound change in pelvic stability and body posture. Posture Control Insoles(TM) work so well because they help the neuromuscular system balance and stabilize the feet.  And... over the course of fitting thousands of patients in clinics across the USA over the past two years, it has been found that Posture Control Insoles(TM) work for  people who dynamically hyperpronate as well as for those who dynamically supinate.  Supinators as it turns out, if there is no structural or medical reason, are hyperpronators in disguise.  They subconsciously brace their muscles to avoid hyperpronation, and end up overcompensating.  We believe Posture Control Insoles(TM) work so well because they work with the natural systems and responses of the body.