How do foot orthotic work in Achilles tendonitis? It always used to bug me how so many claim a pronated foot can cause Achilles tendonitis and you should use foot orthotics for it. I could never understand the rationale behind how a pronated foot could cause achilles tendonitis. There is no doubt that foot orthotics do help Achilles tendonitis (and there is at least one study showing that). Achilles tendon treatment is obviously multifactorial and involves a lot more than just foot orthotics, but I finally understand that rationale for foot orthotics. The soleus muscle that attaches to the Achilles tendon is a very power supinators of the foot (as the Achilles attaches medial to the subtalar joint). Several studies have showed the reduction in the ankle inversion or supination moment with inverted foot orthotics. Foot orthotics reduce the force that the soleus muscle has to contract with and lessons the load on the Achilles tendon. Problem solved.
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