![]() They concluded that the presence of an ankle effusion suggested underlying fracture. The larger posterior fat pad is the triangular, pre-Achilles fat pad" (1)Īnkle Effusion- Correlation with occult ankle fractureĬlark et al (1) investigated the correlation between an ankle effusion and occult ankle fracture. It appears as a thin, linear structure about 1 -2 mm wide, that courses in a nearly straight line from the posterior aspect of the tibia to the posterior superior part of the calcaneus. The juxtaarticular fat pad is closely apposed to the posterior recess. There are two posterior fat pads, a thin juxtaarticular and a larger pre-Īchilles fat pad. Anteriorly the pretalar fat pad usually appears crescentic, and is cradled in the neck of the talus. "(ankle) Fat pads are consistently visualized on the plain radiograph. The distension of the anterior recess (AR) and posterior recess (PR) of the ankle joint are simulated. This is an ankle arthrogram which simulates an ankle effusion. Teardrop Sign: Plain Film Recognition of Ankle Effusion. Scott Dunbar1, Jeffrey Towbin2, Robert Clark3. In the absence of an ankle joint effusion, the area bounded by the dotted line would show a fat density rather than a fluid density Note that it is difficult to be sure of the exact contour of the posterior ankle joint recess. ![]() Same image with the anterior and posterior ankle joint recesses marked. There is an ankle effusion with the anterior and posterior recesses visibly distended with fluid. This patient presented to the ED following fall. ![]() ![]() Normal ankle demonstrating a fat -like density (arrowed)Ībnormal ankle demonstrating a fluid-like density (arrowed) In the presence of an ankle effusion, the capsule can become distended and may appear to have a more fluid-like density The anterior and posterior extra-capsular region of a normal ankle joint should appear as a fat-like density. This page will examine the radiographic soft tissue signs of bony injury of the ankle- what they are, their plain film appearances, their limitations, and their utility.Īn ankle effusion suggests a significant injury to the ankle joint. An equivocal fracture appearance should be considered in the context of other information such as ![]()
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