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Figure 17a. AVN of the talus in a female patient who had undergone renal transplantation. (a) Lateral radiograph of the right ankle shows diffuse sclerosis of the entire talus due to AVN, with sparing of the superior aspect of the talar head (white arrow). The inferior aspect of the talus shows irregular radiolucency (black arrows), with severe narrowing and anterior subluxation of the subtalar joint. (b) Coronal CT scan through the ankle shows sclerosis of the talar dome due to necrosis, along with multiple cystic hypoattenuating areas and fragmentation of the inferior articular surface of the talus (arrows). Note also the severe narrowing of the subtalar joint.
