Lipohaemarthrosis – literally means fat and blood within a…

Lipohaemarthrosis – literally means fat and blood within a joint. Its presence implies an intra-articular fracture with marrow fat having leaked out into the joint. Because fat is less dense than blood it separates on top creating a perfectly straight line known as the FBI sign (Fat-Blood Interface). The sign is best seen on lateral horizontal beam images of the knee within the suprapatellar pouch. The above patient has a tibial plateau fracture

from our tumblr blog

http://radiologysigns.tumblr.com/

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