Positive ulnar variance

Last revised by Yvana Toh on 9 May 2024

Positive ulnar variance describes where the distal articular surface of the ulna is more than 2.5 mm distal to the articular surface of the radius. 

It plays important role in wrist pathology such as ulnar impaction syndromes and thinning of the triangular fibrocartilage complex.

Radiographic features

Maximum forearm pronation results in an increase in positive ulnar variance, whereas maximum forearm supination decreases ulnar variance 1.

See also

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