Monteggia fracture-dislocations are classified by the Bado system. Bado type I injuries are characterized by a proximal ulnar fracture with anterior dislocation of the radial head. This is due to a forceful pronation injury of the forearm and is the most common type. Bado type II injuries are "reversed" Monteggia fracture-dislocation injuries. Here, there is posterior angulation of the ulnar fracture site and posterior dislocation of the radial head. Bade type III and IV injuries are rare.
| A||AP radiograph of the elbow. This shows a comminuted fracture of the proximal ulna.|
| B||Lateral radiograph of the elbow. This demonstrates posterior dislocation of the radial head, a "reversed" Monteggia injury (Bado type II).|
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