Scapholunate ligament tear - cortical ring sign


When there is rotation of the scaphoid as can occur with scapholunate dissociation (widening of distance between scaphoid and lunate to greater than 3 mm), a ring-shaped density can appear as a sign of foreshortening (scaphoid cortical ring sign). If untreated, scapholunate instability progresses to degeneration and collapse of the carpus, known as scapholunate advanced collapse (SLAC).

Radiographer: TSRM Fabio Imola