Lunate fracture and osteonecrosis

This T1-weighted, axial magnetic resonance image of the wrist shows a curvilinear region of increased signal (arrow) traversing the lunate that represents a fracture. The decreased signal intensity throughout the lunate, when compared to the subcutaneous fat or adjacent navicular bone, is consistent with post-traumatic osteonecrosis of the lunate (Kienbock's disease).