The extensor digitorum brevis is the only muscle that originates on the dorsum of the foot. Its tendons insert into the proximal phalanges of the 2nd through 5th toes and aid in extension.
The mechanism of injury is forced inversion of the foot, rapidly stretching the extensor digitorum brevis. The patient whose frontal ankle radiograph is shown here presented after an inversion injury.
On radiography, there is a characteristic appearance of a fracture fragment along the dorsolateral aspect of the calcaneus on frontal views of the ankle (top image) and foot (bottom image).
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