Peroneal tendonitis is an uncommon overuse injury that occurs to the peroneal tendons and sheath, usually just above or below the lateral malleolus. I never used to like seeing patients with peroneal tendonitis. They never seem to get better when I treated them and it always puzzled me. It always great when the research you do has an impact on your clinical practice. This is exactly what happened with peroneal tendonitis. We looked at the force needed to supinated the foot in those with it and it really surprised me how low it was. It was so low, that it easily explained why the tendonitis was there .... it was because the peroneal muscles had to work so hard to stop the foot supinating. That now makes peroneal tendonitis easy to treat with lateral wedging. Changes in running form also alter the load in the peroneal tendons.
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