Pain and swelling of the wrist following a fall on an outstretched hand
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There is widening of the scapholunate interval greater than 4 mm (known as the Terry Thomas sign) with ill-defined signal changes in the scapholunate space consistent with rupture of the scapholunate ligament. There small ganglion cyst in the ulnar aspect of the wrist joint.
From the Radiopaedia.org scapholunate dissociation article:
Scapholunate dissociation represents a significant ligamentous injury that is important to identify on imaging. There is disruption of the scapholunate ligament with resultant instabilit. Presentation is often delayed in the absense of associated fracture, pain is increased by dorsiflexion.
- Wrist Dislocation by Kadeer M Halimi from emedicine.com