Dorsal intercalated segment instability - Radiopaedia. org Dorsal intercalated segment instability (DISI) is a form of carpal instability featuring dorsal tilt of the lunate It occurs mainly after the disruption of the s capholunate ligament and is more often encountered than volar intercalated segment instability (VISI)
Scapholunate Ligament Injury DISI - Hand - Orthobullets Scapholunate Ligament Injury is a source of dorsoradial wrist pain with chronic injuries leading to a form of wrist instability (DISI deformity) Diagnosis is made with PA wrist radiographs showing widening of the SL joint Diagnosis of DISI deformity can be made with lateral wrist radiographs showing a scapholunate angle > 70 degrees
Dorsal intercalated segment instability - Wikipedia The SL angle is an indicator of dorsal intercalated segment instability deformity (DISI) The SL angle goes between: [1] - A line through the long axis of the scaphoid bone - A line perpendicular to the distal articular surface of the lunate bone It should normally be 30°-60° [1]
Carpal instability - The Radiology Assistant DISI or dorsiflexion instability DISI is short for dorsal intercalated segmental instability The intercalated segment is the proximal carpal row identified by the lunate
SLL Tear and DISI Deformity | Radsource This is the DISI (Dorsal Intercalated Segmental Instability) pattern (11a) A tear of the lunotriquetral ligament produces the opposite pattern, VISI (Volar Intercalated Segmental Instability), since the lunate is freed from the triquetrum and pulled volar by the scaphoid
Cause, symptoms treatment | DISI deformity - Physiocheck. us A DISI deformity is a condition in which there is a mutual change in position of two carpal bones in the wrist joint This causes symptoms in the wrist area, particularly when extending the wrist In addition to DISI deformity, there is also a VISI deformity (Volar Intercalated Segment Instability) However, this is much less common
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Scapholunate Ligament Injury DISI | The Bone School Scapholunate Ligament Injury DISI Definition Dorsal Intercalated Segmental Instability CID Anatomy Scapholunate joint - C shaped - 2-3 mm thick dorsally with transverse fibres - thin palmar Dorsal extrinsic ligaments - V shaped, onto trapezium 1 Dorsal RC ligament DRC - radius to triquetrum 2 Dorsal Intercarpal Ligament DIC
Scapholunate Instability - An Update | Radsource Figure 8b shows DISI, where the scaphoid rotates into flexion and the lunate rotates into extension, thus increasing the scapholunate and radiolunate angles Two other radiographic signs can be seen with scapholunate malalignment: the ring sign and the palmar “V” sign