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Monteggia Fracture-dislocation

What is it?

  • Described by Monteggia in 1814, it is a fracture of the ulna associated with dislocation of the radial head. The radial head may dislocate anteriorly, posteriorly or laterally.


Bado's classification is most commonly used:

  • Type 1 - anteriorly angulated ulna fracture + anterior radial head dislocation
  • Type 2 - posterior angulated ulna + posterior / posterolateral radial head dislocation
  • Type 3 - ulnar metaphysis + lateral / anterolateral radial head dislocation
  • Type 4 - proximal third radius and ulna + anterior radial head dislocation

Figure 1 - Monteggia fracture-dislocation


  • Most commonly from a fall onto the hand with forced pronation of the forearm
  • Also from:
    • Direct violence
    • Hyperextension of the hand.

Clinical Features

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Monteggia Fracture-dislocation
Radius and Ulna Fractures together
Single Forearm Bone Fractures
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