Fig. 4A–C.

Computed tomography cuts are shown of a 58-year-old woman with a Regan and Morrey Type I (and O’Driscoll Type I) coronoid fracture and a marginal radial head fracture. (A) A sagittal-plane image shows a marginal fracture of the radial head and (B) the coronoid fracture, although there is no anterior subluxation of the trochlea nor is any rotatory instability seen in (C) a transverse section through the olecranon fossa. Such a pattern, although technically a terrible triad injury, is not unstable in extension and therefore may be treated nonoperatively. This is an example of how basing treatment solely on morphologic features of the fracture, without regard to stability, may lead to less than optimal treatment.