2007•South African Journal of RadiologyOpen access

'Terry Thomas' sign and the 'ring sign' of scapholunate instability : today's two signs

Abubakar Bajwa, A K Bajwa

Abstract

Scapholunate instability (SLI) (also known as scapholunate dissociation or rotary subluxation of the scaphoid) is caused by a tear in the interosseous ligaments of the lunate, scaphoid and the capitate bone with a tear in the dorsal radiocarpal ligaments by acute dorsifexion injury or fractures of the distal radius. The patient complains of wrist pain, weakness of grip and a clicking sensation in the wrist.

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Available abstract

Key concepts: Medicine, Lunate, Scapholunate ligament, Subluxation, Wrist, Wrist pain, Scaphoid bone, Anatomy