- It is the angle between the line that pass through the central axis of the volar rim of the lunate facet of the radius and the line that pass through the long axis of the radius. Tear drop angle less than 45 degrees indicates displacement of lunate facet. Antero-posterior distance (AP distance) - Seen on lateral X-ray, it is the distance between the dorsal and volar rim of the lunate facet of the radius. The usual distance is 19 mm. Increased AP distance indicates the lunate facet fracture. Volar or dorsal tilt - A line is drawn joining the most distal ends of the volar and dorsal side of the radius. Another line perpendicular to the longitudinal axis of the radius is drawn. The angle between the two lines is the angle of volar or dorsal tilt of the wrist. Measurement of volar or dorsal tilt should be made in true lateral view of the wrist because pronation of the forearm reduces the volar tilt and supination increases it. When dorsal tilt is more than 11 degrees, it is associated with loss of grip strength and loss of wrist flexion. Posteroanterior view Radial inclination - It is the angle between a line drawn from the radial styloid to the medial end of the articular surface of the radius and a line drawn perpendicular to the long axis of the radius. Loss of radial inclination is associated with loss of grip strength. Radial length - It is the vertical distance in millimetres between a line tangential to the articular surface of the ulna and a tangential line drawn at the most distal point of radius (radial styloid). Shortening of radial length more than 4mm is associated with wrist pain. Ulnar variance - It is the vertical 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 the screws at the radial side of the distal end radius. Meanwhile, a supinated oblique view of shows the ulnar side