According to the Mason classification of radial head fractures, a fracture of the radial head with a single marginal fragment displaced more than 2 mm is classified as:
- A Type I
- B Type II ✓
- C Type III
- D Type IV
Correct answer: B. Type II
Explanation
Mason Type II is a marginal or split fracture of the radial head with displacement exceeding 2 mm, whereas Type I is undisplaced and treated non-operatively with early mobilisation, and Type III is a comminuted fracture of the entire head. Type IV, added later by Johnston, denotes a radial head fracture associated with dislocation of the elbow. Displaced Type II fractures in adults are generally managed with open reduction and internal fixation using small headless screws.
Reference: Miller's Review of Orthopaedics, 8th ed.
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