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

2218 VII Imaging of the Musculoskeletal System
Figure 47-14. Normal Achilles tendon in a 14-year-old with a calcaneal
stress fracture. A, Lateral radiograph shows the normal sharp interface
between the lucent Kager’s fat pad and the semiradiopaque Achilles
tendon (white arrows). The sclerosis in the calcaneal tuberosity (black
arrowheads) is more subtle radiographically. B, Midsagittal T1-weighted
image shows the sharp interface between the normal, bright Kager’s fat
pad and the normal, straight and uniformly dark Achilles tendon (Ach),
which is uniform in thickness throughout its length. The dark line running
perpendicular to the trabeculae in the calcaneal tuberosity is the stress
fracture (black arrowheads). C, Midsagittal inversion recovery image
reveals no abnormally increased signal in the uniformly dark Achilles
tendon. A normal amount of fluid is present in the retrocalcaneal bursa
(white arrowhead). There is bone marrow edema throughout the calcaneus
as a response to the stress fracture in the tuberosity.
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Ch047-A05375.indd 2218
9/9/2008 5:33:39 PM