VISI
Definition
Volar Intercalated Segmental Instability
- secondary to injury to the lunate-triquetral ligament
Epidemiology
Less common
Aetiology
Caused by fall on outstretched extended wrist
- hypothenar eminence strikes ground first
- isolated LT ligament injury
Can be part of perilunate dislocation
- SL heals
- residual LT laxity