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1General considerations

Typical displacement

Suprasyndesmotic fractures result from external rotation of the talus in the ankle mortise with the foot in pronation (Lauge-Hansen pronation external rotation injuries) causing first a failure on the medial side (malleolar fracture or deltoid rupture). The talus then rotates forwards out of the mortise, disrupting the syndesmosis and applying a twisting force to the fibula which then fractures above the level of the syndesmosis.