SplintER Series: Case of a First Metacarpal Fracture

first metacarpal fracture

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A 22 year-old male was playing football when he fell, landing on his outstretched left arm with his thumb flexed. He now has pain at the base of his thumb. This AP view of the hand best demonstrates the injury (photo credit).

What is this fracture, what additional imaging is needed, and what should be the management plan?