A Monteggia fracture (Bado Type I) in an adult involves:

• A Fracture of the radius with posterior dislocation of the radial head
• B Fracture of the ulna with posterior dislocation of the radial head
• C Fracture of the ulna with anterior dislocation of the radial head ✓
• D Fracture of both radius and ulna with anterior dislocation of the ulna

Explanation

Bado's classification of Monteggia fracture-dislocations: Type I (most common, 60–70%) — fracture of the ulna with anterior dislocation of the radial head; Type II — ulna fracture with posterior radial head dislocation; Type III — ulna fracture with lateral dislocation; Type IV — both forearm bones fractured with anterior radial head dislocation. The key rule is that radial head dislocation direction corresponds to the apex of ulnar angulation. Adults require ORIF of the ulna; radial head usually reduces spontaneously.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

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Written and medically reviewed by the StethoPrep medical team.