Gravity forces the Primus Metatarsus Supinatus foot to abnormally pronate until the 1st metatarsal and hallux rest on the ground.  Bracers compensate by plantarflexing the 1st metatarsal (recruiting the posterior tibialis and peroneus longus muscles).  Releasers compensate by collapsing the entire medial column of the foot.

In bracers, tactile stimulation slowly reverses hypertonicity. This allows 1st metatarsal and hallux to shift back toward their anatomical neutral position.  Clinically, this is reflected in the attenuated PMs values (see model, left).

  Compensated Plantarflexed 1st Metatarsal in the Cavus Foot

Cuernavaca Study - Pressure Plate Analysis using Proprioceptive Insoles (Evaluating Releasers vs Bracers)



A Plantarflexed 1st Metatarsal can Significantly Attenuate (distort downward) the PMS Values