Peroneus Longus (PL) and Brevis (PB) muscles are very important in maintaining normal foot and ankle function and relate to the entire gait mechanism of the body.  The action of PL and PB along with tibialis posterior, that other super muscle, is thought to create a sling mechanism to support the arch.  In ballet, good function of these muscles prevents sickling and allows the dancer to “fish” the foot, which we all know gives a beautiful line en l’air.

These muscles may be prevented from functioning properly if there are restricted joints in the foot, particularly in the cuneiforms, or the fibula at the ankle, and fibula/tibia at the knee.  Trauma to the ankle such as an ankle sprain, is a common cause of dysfunction of these muscles.

Treatment aimed at mobilizing joints in the foot, fibula and at the knee can restore function of PL and PB.  Soft tissue therapy, trigger point therapy and dry needling can be useful.  Rolling out the lateral side of the leg and calf rises with a resistance band to keep the ankle straight, can be used for rehabilitation.