Foot orthotic and achilles tendonitis

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,

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