Peroneal tendon trouble

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Tendonitis is a clinical diagnosis and you have omitted any description of how your doctor arrived at that diagnosis in the first place and how he determined which tendon it might be. So it is a moot point to discuss whether you have or don't have tendonitis just because some tendon is pushed on and you had no pain. Osteochondral defects of the talus often do not show well on x-rays, but should be able to be detected with an MRI. Rheumatoid arthritis is not a localized condition and you would probably have other signs and symptoms.