The patient should be evaluated for:
• Hand dominance
• Level of activity
• Quality of bone
• General medical condition
1. Ulnar styloid process fracture
This is an avulsion fracture of the ulnar styloid.
The ulnar styloid may be avulsed at its tip, or through its base (basi-styloid fracture).
These are classified by AO/OTA as 2U3A1.1 if the fracture is at the tip, or 2U3A1.2 if the fracture is at the base.
The level of avulsion has implications for the integrity of the attachment of the triangular fibrocartilage complex (TFCC) and the stability of the distal radioulnar joint (DRUJ).
2. Simple ulnar metaphyseal fracture
These are simple fractures of the ulnar metaphysis, involving neither the ulnocarpal nor distal radioulnar joints.
These are classified by AO/OTA as 2U3A2.
3. Multifragmentary ulnar metaphyseal fracture
These are multifragmentary metaphyseal fractures of the ulna, involving neither the ulnocarpal nor distal radioulnar joints.
These are classified by AO/OTA as 2U3A3.