Review Question - QID 346

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Triplane Fractures QID: 346 (OBQ06.160)

QID 346 (Type "346" in App Search)

Figures A and B show an AP and lateral radiographs of a 15-year old boy who injured his ankle after skateboarding. What is the mechanism of injury with this type of fracture?

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supination - adduction

11%

402/3764

external rotation

74%

2790/3764

internal rotation

92/3764

pronation - abduction

306/3764

axial load

147/3764

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The fracture shown is a triplane ankle fracture which is an external rotation injury that occurs in patients during early adolescence as described by Spiegel et al in a retrospective review of 237 cases. Kay et al has a nice review of pediatric ankle fractures. CT scans are usually obtained for these fractures and treatment depends on the amount of displacement.