Interpreting Elbow and Forearm Radiographs — Taming the SRU
Fat Pads. On a normal elbow x-ray, only a small stripe of an anterior fat pad should be visible. No posterior fat pad should be seen. Injuries around the joint can produce a joint effusion which will displace the fat pads making them more visible. The anterior fat pad protrudes more and looks pointy; this is what is recognized as the sail sign.