The tibiofibular line: an anatomical feature to diagnose syndesmosis malposition.

Background: Medical imaging of the distal tibiofibular joint requires reliable and simple tools to identify disruption of the syndesmosis. We present an anatomical feature, the "tibiofibular line," which appears on axial computed tomography (CT) images of normal ankles. This feature is a straight line that connects the anterolateral surface of the fibula with the anterolateral tubercle of the tibia at the level of the ankle syndesmosis.