From the case:
Monteggia fracture-dislocation
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There is a comminuted fracture of the mid-diaphysis of the ulna, with radial offset and ulnar angulation of the distal ulna fragment (fracture apex lateral). The radial head is dislocated anteriorly.
Overlying casting material is noted.
Case Discussion
Typical example of a Bado type 1 Monteggia fracture-dislocation.