Fig. 1

Schematic diagram of the process of measuring the wrist joint spacing. Fig. a shows the standard dorsal view of the ulna, radius and lunate after 3D reconstruction. Fig. b shows the distal, middle and proximal layers in the distal radioulnar joint. Fig. c shows the central point of the radial and ulnar contour projection map, taking the distal layer as an example. Fig. d shows the measurement of the palmar, median and dorsal lines