Authors of section


Peter Kloen, David Ring

Executive Editors

Peter Trafton, Michael Baumgaertner

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Ulna, extraarticular, simple

Simple extra-articular fractures of the ulna are classified as 2U1A2 fractures.



X-ray taken from Orozco R et al, (1998) Atlas of Internal Fixation. Used with kind permission.


The radial head can dislocate or subluxate posteriorly with respect to the capitellum (posterior Monteggia lesion). It’s uncommon to have a fracture in this location of the ulna without radial head dislocation and it’s uncommon to have a posterior dislocation of the radial head without fracture of the radial head.

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