Signet ring sign (scaphoid)

Last revised by Arlene Campos on 11 Apr 2024

The signet ring sign or cortical ring sign refers to the rounded cortex of the scaphoid tubercle on a AP or PA wrist radiograph due to rotatory subluxation from flexion of the scaphoid. It is seen in injuries of the scapholunate ligament (scapholunate dissociation) and the related perilunate and lunate dislocations but can be seen in normal wrist radiographs 1,2.

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