We report a case of a 49-year-old patient with an isolated dorsal radial dislocation of the right trapezium that occurred in a context of polytrauma. At first, the lesion went unnoticed. The diagnosis was made 1 month later because of persistent pain in the thumb. An open reduction of the dislocation was carried out, and osteosynthesis using scaphoid-trapezium and trapeziotrapezoid pinning was conducted under fluoroscopic control. The patient was immobilized for 3 months after surgery. After 4 years, the mobility of the thumb was complete and painless.
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