Bado classification is used to classify Monteggia fracture-dislocations:
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type I: anterior dislocation of the radial head and anteriorly angulated ulnar shaft fracture
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type II: posterior dislocation of the radial head and posteriorly angulated ulnar shaft fracture
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type III: lateral or anterolateral dislocation of the radial head and metaphyseal ulnar fracture
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type IV: anterior dislocation of the radial head and ulnar and radial fractures