Os triangulare

Case contributed by Dr Henry Knipe

Presentation

Fall

Patient Data

Age: 66
Gender: Male
X-ray

Wrist

Incidental note of accessory ossicle distal to the ulna fovea. 

Case Discussion

Accessory ossicles of the wrist are important to recognize. This ossicle is probably an os triangulare as it lies distal to the ulna fovea. It may be also be another accessory ossicle, the lunula, which appears in the TFCC but is typically distal to the tip of the ulna styloid.

Other differential diagnosis to be considered would be a persistent ulna styloid (if shortened/absent) or a (acute or chronic) ulna styloid fracture. 

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Case information

rID: 27773
Published: 20th Feb 2014
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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