The lateral Chopart joint ligament is the bifurcate ligament, connecting the anterior calcaneus to both the navicular (calcaneonavicular component) and cuboid (calcaneocuboid component).
Provides primary lateral Chopart joint stability through its two components and is the ligament producing the fleck sign at the calcaneal anterior process when avulsed.
Bifurcate ligament avulsion produces the calcaneal anterior process fleck sign on lateral ankle X-ray. Missed Chopart instability produces chronic lateral midfoot pain.
Avulsion in inversion injury producing a fleck on lateral X-ray, managed conservatively if non-displaced.
Missed bifurcate ligament disruption producing chronic lateral midfoot pain and instability.
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