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Figure 12a. AVN of the talus in a 33-year-old man with a talar neck fracture. (a) Coronal CT scan through the talar dome shows an irregular, approximately 1-cm-thick region of subchondral sclerosis spanning the entire width of the dome (arrows). (b) Corresponding coronal fat-saturated T2-weighted MR image through the talus shows normal subchondral signal intensity across the talar dome (arrows) and high signal intensity throughout the talar body. (c) Coronal follow-up CT scan obtained 5 months later shows a region of subchondral sclerosis (arrows) that is unchanged from the corresponding area seen in a.
