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A 32-year-old man presents to an urgent care center with pain at the metacarpophalangeal (MCP) joint of the thumb, from an injury sustained the previous week when he was skiing and fell onto his hand with his thumb extended. The patient has pain at the MCP joint with range of motion, but he says that he does not have any numbness. He has no fever, no breaks in the skin, no wrist pain, and no other injuries.
View the image taken (Figure 1) and consider what your diagnosis would be.

Painful Metacarpophalangeal Joint After a Skiing Fall