A 40-year-old woman sustains a Monteggia fracture-dislocation. X-ray shows a fracture of the proximal third of the ulna with anterior bowing and anterior dislocation of the radial head. According to the Bado classification, this is:

• A Bado Type II
• B Bado Type III
• C Bado Type I ✓
• D Bado Type IV

Explanation

Bado Type I (the most common, ~70%) involves an anterior dislocation of the radial head with a fracture and anterior angulation of the ulna at any level. Type II has posterior or posterolateral radial head dislocation with a posterior angulation of the ulnar fracture. Type III involves lateral or anterolateral radial head dislocation with a fracture of the ulnar metaphysis (children). Type IV combines Type I with an additional proximal radial shaft fracture.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

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