Fig. 3

Radiological parameters A: Radial height (RH) is the distance between two parallel lines drawn perpendicular to the long axis of the radial shaft, one from the tip of the radial styloid and the other from the ulnar corner of the lunate fossa. Radial inclination (RI) is the angle between one line connecting the radial styloid tip and the ulnar aspect of the distal radius and a second line perpendicular to the longitudinal axis of the radius. Ulnar variance (UV) refers to the relative lengths of the distal articular surfaces of the radius and ulna. B: Volar tilt (VT) is the angle between a line along the distal radial articular surface and the line perpendicular to the longitudinal axis of the radius