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Paediatric Imaging

Ulnar variance

refers to the relative length of the ulna with respect to the radius, determined at the carpal surface. Neutral variance occurs when the bones are of equal length, negative variance occurs when the ulna is shorter and positive variance when the ulna is longer. Ulnar variance affects the distribution of force across the wrist.There is an association between negative ulnar variance and Kienbocks disease whereas positive ulnar variance results in an increased predisposition to triangular fibrocartilage complex injury.

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