Comminuted calcaneus fracture lateral x-ray

This series of three images shows the same calcaneus fracture. The first image shows an extensively comminuted fracture on a plain lateral radiograph, but it is unclear whether the fracture involves the sustentaculum tali or extends into the subtalar joint. The sagittal CT image seen next shows clear extension into the posterior subtalar joint (arrow). The third image is an axial CT that reveals a fracture fragment that includes the sustentaculum tali (arrow).