Final answer:
Negative ulnar variance is notably associated with Kienböck's disease, which is the avascular necrosis of the lunate bone in the wrist.
Step-by-step explanation:
Negative ulnar variance is often associated with Kienböck's disease approximately 75% of the time. This condition is characterized by a shortened ulna relative to the radius at the wrist joint. Negative ulnar variance means that the ulnar head sits more proximally than the radial head when the arm is in neutral position, effectively making the ulna shorter relative to the radius.Kienbock's disease is a condition where the blood supply to one of the small bones in the wrist, called the lunate, is disrupted. This disruption can lead to the degeneration and collapse of the lunate bone.
This anatomical variation can lead to altered load distribution across the wrist, contributing to the development of Kienböck's disease, which is the avascular necrosis (death of bone tissue due to lack of blood supply) of the lunate, one of the central carpal bones in the wrist.