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Scapholunate ligament instability is indicated when the ''scapholunate distance'' is more than '''3&nbsp;mm''', which is called ''scapholunate dissociation''.<ref>{{cite web|url=https://radiopaedia.org/articles/scapholunate-interval|title=Scapholunate advanced collapse|author=Owen Kang and Henry Knipe et al.|website=[[Radiopaedia]]|accessdate=2018-01-05}}</ref> 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.<ref name="FairplayCozzolino2013">{{cite journal|last1=Fairplay|first1=Tracy|last2=Cozzolino|first2=Roberto|last3=Atzei|first3=Andrea|last4=Luchetti|first4=Riccardo|title=Current Role of Open Reconstruction of the Scapholunate Ligament|journal=Journal of Wrist Surgery|volume=02|issue=02|year=2013|pages=116–125|issn=2163-3916|doi=10.1055/s-0033-1343092}}</ref>