Traumatic instability of the wrist. Diagnosis, classification, and pathomechanics. Intercarpal arthrodesis for static and dynamic volar intercalated segment instability.

A volar intercalated segment instability (VISI) deformity features a volar rotation of the lunate mainly after disruption of the lunotriquetral ligament. On lateral imaging, volar flexion of the lunate with a scapholunate angle , measuring <30 degrees and an increased capitolunate angle measuring >30 degrees 1 has been used in the diagnosis.

May 20, 2021 · Lunotriquetral Ligament Injuries are rare traumatic injuries to the wrist that can lead to volar intercalated segment instability (VISI) which is caused by a combination of injury to the lunotriquetral ligament and the dorsal radiocarpal ligament.

Aug 23, 2005 · VISI or volarflexion instability. Volar intercalated segmental instability or palmar flexion instability is when the lunate is tilted palmarly too much. While most DISI is abnormal, in many cases VISI is a normal variant, especially if the wrist is very lax.

May 25, 2024 · Abnormal carpal angles are seen on any lateral or sagittal imaging of the wrist when the wrist is in a neutral position: scapholunate angle <30° capitolunate angle >30° Treatment and prognosis. The mainstay of treatment is surgery, either by early reduction and casting with K-wires or by capitolunate fusion. See also

With attenuation or injury to the dorsal intercarpal ligament, volar intercalated-segment instability (VISI) pattern follows; this can be visualised on lateral radiography. An LTIL tear most commonly results in a VISI deformity. Not only a loading type of trauma, but a rotational force to the wrist can also result in ligamentous injuries.

How can an understanding of wrist motion lead to better treatment and rehab? Why is it important to understand carpal motion? Can the proximal row be dynamically stabilized? Pain with resistive activities, able to work with moderate ache, and able play golf. power forward, center position etc.. Or we will never know.... Why this works?

On a lateral radiograph of a normal wrist, the capitolunate angle measures less than 30°, and if the angle measured greater than 30°, it would represent LTL rupture and VISI . VISI is considered a CID lesion when there is a traumatic etiology and CIND lesion if rheumatic.

Instability (VISI) Lunate is tilted in a volar direction and the capitate is tilted dorsally. This results in scaphoid flexion and gives a scaphoidlunate angle measurement of 21° which is normally 30° - 60° Associate with inuries on ulna side

Volar intercalated segment instability (VISI) is a less common manifestation of dissociative carpal instability. We report a case of posttraumatic acute static volar instability. A 13-year-boy had sustained distal one-third radius and ulna fracture after fall on an outstretched hand.