Abstract
A 23-year-old man suffered left ankle pain and swelling after falling down while snowboarding. He exhibited swelling and ecchymoses around the lateral ankle, and on palpation tenderness and bony protrusion were noted on anterior and inferior apex of the lateral malleolus. Radiograph showed fracture of the lateral process of the talus, and CT scan showed the shape and displacement of the fracture fragment. We performed open reduction and internal fixation 8 days after the injury.The mechanism of the lateral process fracture of the talus is believed to be inversion or eversion of the foot while the ankle is dorsiflexed. The talus is vulnerable to this type of injury because the ankle is almost always dorsiflexed while snowboarding. The fracture of the lateral process of the talus is often misdiagnosed as injury of the anterior talofibular ligament. It is important not to overlook this type of injury, because delayed treatment often leads to osteoarthritis of the talocalcaneal joint.
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