Posterior fat pad sign

The posterior fat pad sign is the visualisation of a lucent crescent of fat located in olecranon fossa on true lateral view of elbow joint with the elbow flexed at a right angle, and it indicates an elbow joint effusion. Normally, the posterior fat pad will not be seen on this view. 

In an appropriate setting of trauma, it can be a clue for occult nondisplaced fractures, in particular supracondylar fracture in children or radial head fracture in adults. 

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Article Information

rID: 45371
Section: Signs
Synonyms or Alternate Spellings:

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    Case 1: with radial head fracture
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