Intercalated segmental instability

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Easiest to evaluate the lunate on lateral with respect to capitate


Dorsal intercalated segmental instability (DISI)

  • Lunate is tilted >30 degrees dorsally with respect to capitate


Ventral intercalated segmental instability (VISI)

  • Lunate is tilted >30 degrees ventrally with respect to capitate
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