Location

Wrist

Diagnosis

Rotary subluxation

Discussion

Multiple images of navicular disorientation with dislocation of the scapholunate joint. The scaphoid bone, seen along it long axis, has a ringed cortex appearance. The cortical ring sign is a sign of scapholunate dislocation, and it was first described in 1970 in a young patient with bilateral dislocation of the carpal naviculars. This sign, also known as the signet-ring sign, is caused by the abnormal orientation of the scaphoid.

Reference

Crittenden JJ, Jones DM, Santarelli AG: Bilateral rotational dislocation of the carpal navicular. Radiology 1970, 94:629-630.

Figures

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Attachments:


wristsignetringls.jpg (image/jpeg)


wriatsignet.jpg (image/jpeg)