distance between a horizontal line parallel to the articular surface of the radius and another horizontal line drawn parallel to the articular surface of the ulnar head. Positive ulnar variance (ulna appears longer than radius) disturbs the integrity of triangular fibrocartilage complex and is associated with loss of grip strength and wrist pain.

Oblique view
* Pronated oblique view of the distal radius helps to show the degree of comminution of the distal end radius, depression of the radial styloid, and confirming the position