Fig. 3. (A) Radioscaphoid angle (RSA) was defined as the angle between the axes of the radius and scaphoid. (B) Modified capitate height ratio (MCHR) was determined by the ratio of a (base of the third metacarpal to the distal articular surface of the radius) to b (longitudinal length of the capitate). (C) Modified carpal-ulnar distance ratio (CUDR) was defined by the ratio of c (the distance between the center of the capitate head and the ulna's longitudinal axis) to b (the longitudinal length of the capitate).