Kienbock disease is the eponymous name given to avascular necrosis (aseptic necrosis) involving the lunate. Typical MRI findings include:

• sclerosis (low T1 and T2) centrally and within the radial aspect of lunate
• bone edema (high T2, intermediate T1) may be seen in the acute phase, particularly on the radial side
• 75% of cases are associated with negative ulnar variance

There are several important causes of abnormal lunate signal on MRI, the most frequent causes being Kienbock disease (25%), ulnar impaction syndrome (25%), and intra-osseous ganglia (20%).