Schematic representation of the stages of Kienbock disease

Kienbock's disease is a progressive collapse of the lunate. There are four radiographic stages: 1) Normal radiograph. 2) Increased density, but the shape of the lunate remains intact. 3) Collapse of the lunate with proximal displacement of the capitate, rotation of the scaphoid, and negative ulnar variance. 4) Severe collapse, sclerosis, and osteophyte formation in the remaining wrist.