Os triangulare

Case contributed by Henry Knipe


Fall. Painful wrist.

Patient Data

Age: 22
Gender: Male

Well corticated bony fragment distal to the ulna fovea, adjacent to the ulna styloid. Most consistent with an accessory ossicle - os triangulare

Annotated image

Annotated image thanks to Dr Ian Bickle.

Case Discussion

Accessory ossicles are an important differential diagnosis to fractures, especially in the wrist where more than 20 have been documented. 

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