Occurs when all the ligaments are intact. The midcarpal & radiocarpal joints move in different directions when wrist moves in Radial & Ulnar Deviation. During radial deviation, the proximal carpal row flexes and slides ulnarly and distal carpal row moves radially and exactly reversal occurs when the wrist moves in ulnar deviation. During flexion of the wrist proximal carpal row slides dorsally and angulates volarly. An exact reversal occurs during extension. To understand VISI or DISI patterns of instability a capture from PowerPoint presentation comes in handy.