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EMCORE BLOG

Scapholunate Dissociation

4/14/2016

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Picture
The typical case is a patient presents with trauma to the wrist and wrist pain. You do an x-ray. What do you think?
This is a Scapholunate dissociation, also called rotatory subluxation of the scaphoid and sometimes knows as the Terry Thomas sign. It is a disruption of the scapholunate ligament with resultant instability. The cause is usually trauma and the complication is degenerative arthritis of the joint. The x-ray of the wrist will demonstrate a widened scapholunate space, usually greater than 4mm. This is best seen on a clenched fist view.
Image from www.radiopaedia.com 
The scapholunate ligament is U shaped and divided into three compartments. A complete fear of the dorsal part, results in dissociation.

This is known as the Terry Thomas Sign for obvious reasons.
Picture
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