Drawings of lateral views of the radius illustrate Colles, Smith, and Barton fractures. The Smith and Colles fracture-dislocations are nonarticular. The Barton fracture is articular involving the radiocarpal joint. The Barton distal fracture fragment may be displaced in either a dorsal or ventral (volar) direction.
An AP wrist plain film, a space is seen between the Scaphoid and the lunate , where ordinarily they are closely apposed. This is abnormal which means that the scapholunate ligament is ruptured. This is diagnostic of a rotatory subluxation of the navicular. This has been called the Terry Thomas sign after a famous British actor (1950s) who had a gap between his two front teeth !!