Authors of section

Authors

Paulo Barbosa, Felix Bonnaire, Kodi Kojima

Executive Editors

Steve Krikler, Chris Colton

Open all credits

Infrasyndesmotic, lateral isolated fracture

When the lateral injury is a transverse fracture of the lateral malleolus below the syndesmotic ligament this classified as an AO/OTA 44A1.3 fracture.

Infrasyndesmotic fractures (AO/OTA Type 44A) occur with the foot supinated and an adduction force applied to the talus, causing the lateral structures to fail in tension.  Isolated lateral side injuries, with the medial side intact, are classified as AO/OTA group 44A1. These correspond to supination-adduction fractures stage I in the Lauge-Hansen classification.  

Transverse fracture of the lateral malleolus (AO/OTA 44A1.3)
Complete radiological evaluation (AP, lateral and AP with internal rotation) is crucial for correct classification and decision making.
definition