The use of foot orthotics for Achilles tendonitis is the subject of an interesting blog post. It is suggested that foot orthotic work in Achilles tendonitis because they change the supination moment. It is suggested that a heel raise does not help Achilles tendonitis by shortening the distance between the origin and insertion of the calf muscles. They cite evidence that supports this. They also mention a study in which foot orthoses designed by a podiatrist fixed those with Achilles tendonitis, but they all pronated more with the use of the foot orthotics. This is kind of paradoxical. More on Achilles tendonitis treatment. Contributed by Croydon Total Footcare.