Diagnosis

Ulna, partial articular, coronoid (AO/OTA 2U1B2)

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Isolated fractures of the coronoid are classified as 2U1B2 fractures.

This fracture has the following qualifiers:
• n – involving the sublime facet
• o – tip (avulsion)
• p – < 50% (illustrated)
• q – ≥ 50%

An isolated fracture of the anteromedial facet of the coronoid process is associated either with avulsion of the origin of the lateral collateral ligament complex from the lateral epicondyle or fracture of the olecranon or both.

The X-ray shows an anteromedial facet fracture with a LCL injury.