Ankle and Foot 47 - Department of Radiology - University of ...

2266 VII Imaging of the Musculoskeletal System 47 Ankle and Foot 2266 47
Figure 47-75. Osteochondral lesion of the talus
(OLT) in a 14-year-old with ankle pain.
Anteroposterior (A) and mortise (B) radiographs
demonstrate a subtle OLT of the medial talar dome
(open arrow). MRI was obtained 2 months later.
C, Coronal T1-weighted image demonstrates the OLT
of the medial talar dome (open arrow). D, The
corresponding coronal T2-weighted fat-suppressed
image shows a bright line of fluid (arrows) around the
OLT, indicating it is unstable.
A
B
C
D
A
B
Figure 47-76. Lateral process of the talus (LPT) fracture in a 17-year-old gymnast who landed awkwardly after a vault. A, Lateral radiograph
demonstrates the slightly displaced, transversely oriented LPT fracture (arrowheads). B, Sagittal CT confirms the LPT fracture (arrowheads) seen in
A. Given the relatively small size of this fracture, the patient was treated nonoperatively with casting and then with physical therapy. (This scan
was performed using an older protocol, with source images 1 mm thick at 1-mm intervals. This lack of overlap yields reformatted images with
some stair-step artifacts that can be seen in the metatarsal shaft. This artifact can be avoided by reconstructing source images with a 50% overlap.)
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9/9/2008 5:35:07 PM