Fractures of the coronoid: morphology based upon computer tomography scanning.

Coronoid fractures have traditionally been described by the Regan-Morrey classification system, based upon lateral plain film radiographs. However, use of computer tomography (CT) scans to determine fracture morphology, define associated injuries, and make treatment plans is now commonplace. In addition, it is increasingly recognized that classification systems based upon plain film imaging studies may not be adequate to describe complex fracture patterns. The purpose of the present investigation was to review CT scans obtained for elbow trauma to describe coronoid fracture morphology and determine inter- and intra-observer reliability.

By examination of these 2- and 3D CT scans, we have described the anatomic patterns by which coronoid fractures break. Five common patterns were noted: a ‘‘tip’’ type fracture seen in 29% of the cases; a ‘‘mid-transverse’’ type fracture (24%); a ‘‘basal’’ type fracture (23%); and two ‘‘oblique’’ type fracture patterns (24%) including an ‘‘anteromedial’’ type fracture (17%) and an ‘‘anterolateral’’ type (7%) > from Adams et al.; J Shoulder Elbow Surg 21 (2012) 782-788. All rights reserved to Elsevier Ltd.

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