Fractures of the ulna's coronoid process are uncommon, whether associated with the elbow dislocation or isolated fractures limited only to the coronoid process ^1-3. The O'Driscoll classification system distinguishes these fractures into three types ^1,2,4. Type I transverse coronoid tip fractures, type II injuries involve the anteromedial facet and type III fractures through the coronoid process's base ^1,2,4. Radiologists should describe these fractures using the same classification systems adopted by orthopedic surgeons ^2,5.

This case is a typical example of an O'Driscoll type II fracture of the ulna's coronoid process, requiring surgery with internal fixation.