Ulnar fracture and radial head dislocation
Fall onto outstretched arm from monkey bars. Deformed forearm and pain.
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Obvious fracture of the ulna diaphysis. On the lateral view you might be tempted to call this a greenstick fracture but if you look carefully, the fracture extends all the way through the bone and, on the AP, there is malalignment.
On the lateral, the radial head does not align with the capitellum - it is dislocated.
When there is a radial or ulnar shaft fracture, look specifically for a fracture of the other bone, or a dislocation of the radial head or distal radioulnar joint.