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O’Driscoll classification for coronoid process fractures: Type I, transverse fractures of the coronoid tip in which the fracture lines are confined to the coronoid tip; Type II, fractures of the anteromedial facet in which the fracture lines run past the coronoid tip and the anteromedial facet; and Type III, large fractures involving ≥50% of the coronoid height in which the fracture lines travel into the body and basal part of the coronoid.
