There are two peroneal tendons. They both start in the lower leg, wrap around the outside of the ankle and lateral malleolus (fibula). One ends at the base of the 5th metatarsal on the outside of the foot, called the brevis, and the other goes underneath the foot to end at base of the 1st metatarsal, called the longus. These tendons evert and plantarflex the foot, for example, they are used when walking uphill or making the foot rotate outward. The tendons can be injured with an ankle sprain. The brevis can even snap off a part of the 5th metatarsal in a more severe injury. This is why it is important to x-ray the foot after an ankle sprain. Tendon injuries may require protected weightbearing, non-weightbearing, or surgical correction. Old tendon injuries may need extracorporeal shockwave therapy. For more information, please click this link.