Dorsal intercalated segment instability

Dorsal intercalated segment instability (DISI) is one of the types of instability involving the wrist. It occurs because of a disruption of the dorsal intercarpal ligament

Aetiology
Plain radiograph

On an AP view, the normal trapezoidal configuration of the scaphoid may be lost and it may appear triangular.

On the lateral radiograph, it typically shows a dorsal tilt of the lunate:

and

  • capitolunate angle  >30º:  the capitate is displaced posteriorly compared to the distal radius
MRI

On MRI, the same findings as on plain film are seen. However, bone contusion, scaphoid avascular necrosis and scapholunate ligament injury are evaluated with more precision.

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Article Information

rID: 9709
Section: Pathology
Tag: wrist
Synonyms or Alternate Spellings:
  • DISI
  • DISI deformity
  • Dorsiflexed intercalated segment instability

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Cases and Figures

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    Case 1
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    Case 2: following scaphoid fracture
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    Case 3
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    Case 4
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