All,
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I wanted to pick up on something I intimated about in the biomechanical explanation thread http://www.podiatry-arena.com/podiatry-forum/showthread.php?t=15319
It has been taught, and may well still be being taught ( a quick search of t'interweb suggests it is ;)), that a flexible forefoot valgus will be "compensated" through supination at the midtarsal joint. Supination being the combined movement of adduction, inversion and plantarflexion. Yet if we view the work of Nester, Findlow and Bowker: http://www.rxlabs.com/upload/pdf/Scientific_MTJ(2001).pdf
we see from figure 4. that it is physically impossible to achieve supination from forefoot loading through toe-off with the midtarsal joint axial positions obtained by these workers. We also note the movement available at the other joints of the midfoot, those distal to the talonavicular and calcaneocuboid joints (I always had a problem with the way Root seemed to forget about these) and ask the question: how does "compensation" for a flexible forefoot valgus et al. occur in light of modern biomechanics theories? And how does variable joints stiffness influence this?
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