What is the classification for ulnar styloid fractures?

Updated: Apr 26, 2021
  • Author: David M Lichtman, MD; Chief Editor: Harris Gellman, MD  more...
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Ulnar styloid fractures occur as isolated injuries or in association with distal radius and other wrist fractures. [20] Symptomatic nonunion is rare. Such nonunion of fractures has been classified into the following two types, depending on the location and stability of the DRUJ:

  • Type 1 nonunion - Located at the tip of the styloid; the TFCC remains intact, and the DRUJ is stable
  • Type 2 nonunion - The fracture occurs at the base of the styloid; the attachment to the TFCC is disrupted, resulting in an unstable DRUJ

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