<prompt> Kienbock disease is avascular necrosis of:ScaphoidTrapezoidTrapeziumLunate  <response>: Ans. d LunateRef: Maheshwari 5th ed. 318 It is breakdown of the lunate bone, a carpal bone in the wrist that articulates with the radius in the forearm. Specifically, Kienbocks disease is another name for avascular necrosis with fragmentation and collapse of the lunate. This has classically been attributed to arterial disruption, but may also occur after events that produce venous congestion with elevated inter-osseous pressure. 