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The peroneus longus muscle is one of two muscles in the lateral compartment of the lower limb, along with the peroneus brevis muscle.[1] The lateral compartment receives innervation from the superficial peroneal nerve (L5-S2), supplied by the anterior tibial and peroneal arteries. It is important in plantar flexion and eversion of the foot and ankle. The peroneus longus muscle is susceptible to several pathologies, including tendonitis, tendon dislocation, subluxation, rupture, and acute and chronic compartment syndrome.[2][3]