Ulna, extraarticular, metaphyseal multifragmentary (AO/OTA 2U1A3)


Multifragmentary metaphyseal fractures of the ulna are classified as 2U1A3 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 part 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.

The bottom illustration shows a Jupiter Type B Posterior Monteggia without radial head fracture - an extremely uncommon event.



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v2.0 2018-04-30