Fractures involving the coronoid process of the proximal ulna can be classified using the scheme of Regan and Morrey. The severity of the fracture correlates with management and outcome. The authors are from the Mayo Clinic.
Parameters:
(1) level of fracture (parallel to long axis of bone, as seen in lateral X-ray)
(2) presence or absence of dislocation
An additional item include would be whether the fracture was open or closed.
Parameter
Finding
Term
level of fracture
avulsion through tip
Type I
more than avulsion but <= 50%
Type II
> 50%
Type III
dislocation
absent
A
present
B
A closed fracture of type I or II can usually be managed by immobilization in cast or splint.
Many type III and some type II fractures may require open reduction and internal fixation.
An open fracture will usually require some debridement.
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