What is ulnar variance?
Ulnar variance describes the relationship between the lengths of the radius and ulna as seen at the wrist. Positive ulnar variance refers to the situation in which the ulna is longer than the radius and is associated with degenerative disease of the TFCC. Negative ulnar variance describes the situation in which the ulna is shorter than the radius, and is associated with Kienböck’s disease. Both of these entities will be discussed below.
