Isolated posterior malleolus fracture
Trauma. Unable to weight bear.
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Ankle joint effusion seen as an opacity protruding anteriorly from the ankle joint on the lateral projection. An undisplaced posterior malleolus fracture is also seen on the lateral projection.
Isolated posterior malleolus fractures are rare. They are the result of axial loading and compression mechanism, and were initially described as "paratrooper fracture" and while still rare is a known injury associated with parachuting. The mechanism in this patient is unknown.
- Harish V. Kurup, Prabhakar Rao. Isolated posterior malleolus fracture: a rare injury mechanism. European Journal of Orthopaedic Surgery & Traumatology, 2005, Volume 15, Number 2, Page 182.
- Comat G, Barbier O, Ollat D. The posterior malleolar fracture: a parachute injury not to be overlooked. Orthopaedics & traumatology, surgery & research : OTSR. 100 (4): 419-22. doi:10.1016/j.otsr.2014.02.008 - Pubmed