The peroneal tendons are located on the lateral or external side of the ankle and are two: one that belongs to the long peroneal muscle and another that belongs to the short peroneum. In their journey both travel behind the lateral ankle malleolus, to be inserted at the base of the fifth toe (the short peroneal tendon) and in the lower part of the foot, crossing the arch of the foot (the long peroneal tendon).
The function of the peroneal tendons is to help move the ankle both down and laterally or sideways. It also helps in achieving lateral ankle stability in activities that involve movement from side to side. This article is about a particular tendon injury: peroneal tendonitis.
What is tendonitis of the peroneal muscles?
Tendonitis of one or both of these tendons simply means an inflammation of the tendons. Tendons often swell with excess use and agility activities (such as tennis, basketball, volleyball and soccer, but especially in runners) that place significant stress on the lateral tendons.
Also, if you have had ankle sprains in the past, the chance of having peroneal tendon problems increases. When the ligaments break or stretch, they are not able to provide the stability for which they are designed and the lateral tendons are forced to work harder in order to provide lateral stability.
Why does it occur?
As it was said, repetitive overloads injure the tendon: when a person has to constantly bend the foot outwards, be it by wearing bad shoes, heel deviations inward or sudden increases in training the tendons work excessively to carry Foot out.
The more they work, the more small lesions accumulate, leading to tendinitis. In the image below you will observe the movement that repeatedly injures these tendons.