Figure 2.

Radiographic measurements. Ulnar variance is measured as the difference i axial length between two lines perpendicular to the longitudinal axes of the radius. The two lines are placed against the most distal points of the ulnar and radial articular surfaces, respectively. Dorsal/volar tilt of the radial articular surface is measurend as the angle between two lines, one line connecting the palmar and dorsal surfaces of the distal radius and a line perpendicular to the longitudinal axes of the radius.