Bony markers at the distal end of the radius for estimating handedness and radial length.

Measurements of the size of the bony markers at the distal end of the radius as well as the length of the radius in 61 left and 64 right dry radii were statistically analyzed. Since 90-95% of the general population is right-handed, as based on differences in the size of the right sided markers relative to the left, it is proposed that the greater distance between the dorsal tubercle and styloid process and the greater dorso-palmar diameter of the carpal articular surface opposite the dorsal tubercle are indicative of right-handedness. The length of the radius correlated with: the radio-ulnar transverse diameter at the distal end; the distance between the dorsal tubercle and the styloid process; the dorso-palmar diameter of the distal end opposite the dorsal tubercle; the dorso-palmar diameter of the carpal articular surface opposite to the dorsal tubercle; the dorso-palmar diameter of the distal end opposite the medial margin of the groove for the extensor pollicis longus; the dorso-palmar diameter of the distal end opposite the floor of the groove for the extensor pollicis longus and, finally, the height of the dorsal tubercle in relation to the posterior margin of the carpal articular surface (P < 0.001). Regression equations of the length of the radius for these markers have been derived.