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. It is more often encountered than volar intercalated segment instability (VISI).

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 with the wrist in neutral position, DISI typically shows a dorsal tilt of the lunate with both of the following are present:

CT

On sagittal CT, the same findings as on plain film are seen.

MRI

On sagittal MRI 9, 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
Tag: wrist
Synonyms or Alternate Spellings:
  • DISI
  • DISI deformity
  • Dorsiflexed intercalated segment instability
  • Dorsal intercalated segmental 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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