In radiology, the<unk>  is a scapholunate ligament dissociation on an anteroposterior view of the wrist. Most commonly a result of a fall on the outstretched hand (FOOSH), the scapholunate ligament ruptures resulting in separation of the lunate and scaphoid bones. This burst causes the scaphoid bone to dorsally rotate. A gap of more than 3mm is pathognomonic for scapholunate dissociation. The resulting separation between the scaphoid and lunate bones leaves a space on the x-ray that is similar to the gap comedian<unk><unk>  had between his front teeth. For newer radiology students who do not know who<unk><unk>  was, this finding might also be known as the David Letterman sign.
Terry Thomas sign
John Thomas sign
Claybrook sign
Gorlin sign
Markle sign
Lincoln sign
Blumberg sign
Bing's sign