Diagnosis

Extraarticular fracture of the ulna

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Clinical examination

The patient should be evaluated for:

• Age
• Hand dominance
• Occupation
• Level of activity
• Quality of bone
• General medical condition

Options
1.  Ulnar styloid process fracture
2.  Simple ulnar metaphyseal fracture
3.  Multifragmentary ulnar metaphyseal fracture

1.  Ulnar styloid process fracture

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).

Ulnar styloid process fracture, AP view

2.  Simple ulnar metaphyseal fracture

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.

Simple ulnar metaphyseal fracture imaging

3.  Multifragmentary ulnar metaphyseal fracture

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.

Multifragmentary ulnar metaphyseal fracture view