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 Diagnosis of DISI deformity can be made with lateral wrist radiographs showing a scapholunate angle > 70 degrees Treatment of acute SL ligament injuries may be immobilization versus operative repair reconstruction depending on degree of displacement
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]
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
SLL Tear and DISI Deformity | Radsource This angle can be calculated on MRI by adding the dorsal tilt angle of the lunate and the volar tilt angle of the scaphoid relative to vertical While DISI is an indicator of a significant SLL tear, DISI may develop with a completely intact SLL in the case of an unstable scaphoid waist fracture
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