Musculoskeletal - Posterior Fat Pad
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Posterior fat pad aka Sail sign, is one of the common findings that we look for after a traumatic elbow injury that can indicate an underlying fracture. It represents hemarthrosis pushing the fat pad superiorly causing the triceps tendon to tilt. Plain films has been used as the initial modality of choice to look for sail sign but POCUS has been shown to be highly sensitive (97%) and specific (88%). It can be seen as anechoic fluid between the olecranon, humerus and fat pad. Source: Avci et. al. (PMID: 27645809). Also note the broken crystal on this image causing a dark artifact anteriorly. Dr. Maan Al Dubayan, Steven Greenstein, and Matthew Riscinti - Kings County Emergency Medicine