Fig. 4.

Rotary subluxation of the scaphoid. Imaging findings in three different patients. a Posteroanterior radiograph of the wrist shows a widened scapholunate distance (black arrow) and foreshortening of the scaphoid with a “signet ring” sign (white arrowheads). b Lateral radiograph (left image) and sagittal CT reformat image (right image) of the wrist demonstrating an increased scapholunate angle of 70° on radiograph (black lines) and increased radioscaphoid angle of 65° on CT (white lines). c Lateral wrist radiograph showing subluxation of the scaphoid onto the dorsal rim of the radius (black arrowheads)