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Figure 13a. AVN of the anterior talus in a 33-year-old man injured in a motor vehicle accident. (a) Axial CT scan through the talar dome reveals focal sclerosis in the anterior part of the dome (arrows), a finding that corresponds to an osteonecrotic segment. The posterior two-thirds of the dome shows normal bone marrow attenuation, which correlates with normal attenuation in the fibula. (b) Corresponding fat-saturated T2-weighted MR image shows diffuse increased signal intensity in the posterior two-thirds of the dome and normal bone marrow signal intensity in the anterior third. A serpiginous line separates these two regions (arrows).
