Shin splint is an overuse injury caused by chronic traction and inflammation of the tibial periosteum. It may involve either tibialis muscles or the soleus muscle and is characterized by anteromedial or posteromedial leg pain of gradual onset. Pain occurs at the start of running, then decreases, and returns after the athlete stops running. Tenderness is found on palpation of the posterior medial border of the tibia, usually at the junction of the middle and distal thirds. Mild to moderate swelling can be present at the site of pain. Radiographs are normal, but a bone scan shows fusiform uptake of tracer. Shin splint is sometimes called medial tibial stress syndrome.