The O'Driscoll classification system of coronoid process fractures distinguishes three types of coronoid process fractures of the ulna, and this classification system is useful when assessing further treatment options 1-4.
- type I: transverse coronoid tip fractures, which affect one-third of the process
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type II: injuries involve the anteromedial facet, with subtypes varying according to the fracture's location along the facet and the sublime tubercle's degree of involvement
- subtype 1: involvement of only the anteromedial portion
- subtype 2: involvement of anteromedial portion and tip
- subtype 3: involvement of anteromedial portion, tip, and >50% of sublime tubercle
- type III: involve the coronoid process base, with disruption of more than 50% of the coronoid body
Small type I injuries can be treated non-operatively if stability is maintained; however, if these fractures are associated with instability, it requires surgical repair 1-4. In general coronoid process fractures, type II and III require surgical repair to maintain elbow stability, and the surgical approach varies by fracture type 1-4.
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