Dacatra

Type C Malleolar Fracture


A type C malleolar fracture occurs when the foot is in pronation and an extended rotation force is
applied to the ankle joint. First the deltoid ligament ruptures or the medial malleolus is avulsed.
The talus rotates externally, it forces the fibula to twist about its vertical axis. The result is a
rupture of the anterior syndesmotic ligament, then the interosseous ligament follows. A fracture of
the Volkmann's triangle is caused by shearing of the talus.
The internal fixation is performed with a 7-hole one-third tubular plate with a lag screw through the
plate. The medial malleolus and the Volkmann's triangle are fixed with lag screws. A positioning
screw secures the syndesmotic ligaments temporarily.

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