I'm a student and I'm a bit confused with a step in the positive cast preparation. I'm sure this is very fundamental: What is functional purpose of the medial arch fill in?
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This plaster addition obviously alters the height of the medial longitudinal arch, however how does the height of the orthotic's medial arch affect the midtarsal joints? I'm guessing that a small medial arch fill in (say 1/8) will decrease midtarsal joint range of motion due to the STJ supinatory moment that an increased arch height would impart.
A quick explanation from someone in the know would be appreciated.
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