MASS foot orthotic position theory has been proposed by Ed Glaser, DPM from Sole Supports Inc. MASS stands for Maximum Arch Subtalar Supination. It is a position of the foot that is much more supinated than the traditional subtalar joint neutral position, but also maintains the forefoot on the ground (no varus or valgus captured). Ed advocates the use of semi-weightbearing foam box as opposed to plaster (though it is not difficult to reproduce the position non-weightbearing with plaster bandage). The position results in a very different foot orthotic shape that is what is traditionally used. For more see comments on the Boot Camp site: MASS Foot Position Theory and the threads on Podiatry Arena tagged with MASS position theory (they do get a little heated).
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