X-ray of scapholunate instability
Author:
Mikael Häggström [notes 1]
Planning
Required projections are posterior anterior (PA), a lateral view X-ray, and then either fist view X-ray[1] or X-rays in ulnar and radial deviation.
Diagnosis
Scapholunate ligament instability is indicated when the scapholunate distance is more than 3 mm, which is called scapholunate dissociation.[2] A static instability is generally readily visible, but a dynamic scapholunate instability can only be seen radiographically in certain wrist positions or under certain loading conditions, such as when clenching the wrist, or loading the wrist in ulnar deviation.[3]
Static scapholunate dissociation
Dynamic instability: Increased scapholunate distance (between yellow lines) upon ulnar deviation of the wrist, but not otherwise.
Dynamic scapholunate instability visible upon clenching the wrist
Scapholunate ligament disruption associated with a colles fracture
References
- ↑ Novelline, RA (2004). Squire's fundamentals of radiology, 6th Edition (6th ed.). United States of America: President and fellows of Harvard college. ISBN 0-674-01279-8.
- ↑ Owen Kang and Henry Knipe et al.. Scapholunate advanced collapse. Radiopaedia. Retrieved on 2018-01-05.
- ↑ Fairplay, Tracy; Cozzolino, Roberto; Atzei, Andrea; Luchetti, Riccardo (2013). "Current Role of Open Reconstruction of the Scapholunate Ligament ". Journal of Wrist Surgery 02 (02): 116–125. doi:. ISSN 2163-3916.
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