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Figure 14a. Collapse and fragmentation of the talus in a 61-year-old man who had sustained minor trauma. (a) Coronal CT scan of the right ankle shows collapse of the articular surface of the talar dome (white arrows) and a vertical split fracture extending from the talar dome into the subtalar joint (black arrow). In addition, there is a curvilinear sclerotic line within the talar body (arrowheads) that represents necrotic bone. (b) Corresponding axial CT scan through the talar dome shows linear fractures through the posterior aspect of the dome (black arrows). The bone attenuation of the talar dome looks diffusely increased compared with that of the distal tibia and fibula. In addition, there is a small, ossific hyperattenuating area at the lateral aspect of the talus (white arrow), likely due to prior trauma.
