Extremities Limited Scope Practice Exam

Monteggia fracture involves fracture of which bone and dislocation of which structure?

Proximal ulna fracture with radial head dislocation Distal ulna fracture with radial head dislocation Proximal radius fracture with radial head dislocation Distal radius fracture with radial head dislocation

Correct Answer:

Proximal ulna fracture with radial head dislocation

Explanation:

Monteggia fracture is defined by a fracture of the proximal ulna with dislocation of the radial head at the radiocapitellar joint. This pattern is what radiographs typically show: the ulna broken near the elbow and the radial head displaced relative to the capitulum, often anteriorly in children. The other scenarios involve fractures at the distal forearm or fractures of the radius itself, which do not match the classic Monteggia combination.

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