Os triangulare

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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 ^1,2.

They may be unilateral or bilateral and the main differential diagnosis is non-union of an ulnar styloid process fracture ^1,3.

Differential diagnosis

lunula: lies at the tip of the ulnar styloid
persistent ulnar styloid ossicle
old ununited ulnar styloid fracture

-The os triangulare (also known as the os intermedium antebrachii or os triquetrum secundarium) is an <a href="/articles/accessory-ossicles-of-the-wrist">accessory ossicle</a> located between the <a title="Ulna" href="/articles/ulna">ulnar styloid</a>, <a href="/articles/lunate-1">lunate</a> and <a href="/articles/triquetrum">triquetrum</a> 1,2.They may be unilateral or bilateral and the main differential diagnosis is non-union of an <a title="Ulnar styloid fracture" href="/articles/ulnar-styloid-fracture-2">ulnar styloid process fracture</a> 1,3.<h4>Differential diagnosis</h4><ul>
+The os triangulare (also known as the os intermedium antebrachii or os triquetrum secundarium) is an <a href="/articles/accessory-ossicles-of-the-wrist">accessory ossicle</a> located between the <a href="/articles/ulna">ulnar styloid</a>, <a href="/articles/lunate-1">lunate</a> and <a href="/articles/triquetrum">triquetrum</a> 1,2.They may be unilateral or bilateral and the main differential diagnosis is non-union of an <a href="/articles/ulnar-styloid-fracture-2">ulnar styloid process fracture</a> 1,3.<h4>Differential diagnosis</h4><ul>
~~-<li><a href="/articles/ulnar-styloid-fracture-2">ulnar styloid fracture</a></li>~~
+<li>old ununited <a href="/articles/ulnar-styloid-fracture-2">ulnar styloid fracture</a>
+</li>

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Os triangulare

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Differential diagnosis

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