Score: Regan-Morrey classification

Use: Coronoid process fractures

Type I

A fracture of the intra-articular tip of the coronoid. No long-term instability is present.

Type II

A fracture involving half or less of the coronoid. Ulno-humeral stability may be significantly affected.

Type III

A fracture involving more than 50% of the coronoid process. This is very often associatd with posterior elbow instability.

Reference

Classification and Diagnosis in Orthopaedic Trauma. Editors: Rahij Anwar, Kenneth W. R. Tuson, Shah Alam Khan. Cambridge University Press, 2008