Os triangulare

nicht verwechseln mit: Os triquetrum / Os trigonum

The os triangulare (also known as the os intermedium antebrachii or os triquetrum secundarium) is an accessory ossicle located between the ulnar styloid, lunate and triquetrum .

They may be unilateral or bilateral and the main differential diagnosis is non-union of an ulnar styloid process fracture .

Differential diagnosis

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