Bridge plating in the setting of radiocarpal instability: Does distal fixation to the second or third metacarpal matter? A cadaveric study

Figure 4 Chamay and Bouman techniques for measuring ulnar translocation. A: Chamay’s index is calculated by dividing the distance between a line parallel to the axis of the radius passing through the radial styloid process and the center of rotation of the capitate (L3) and the length of the long finger metacarpal (L1)[25]; B: Bouman’s index is calculated by dividing the length of the distal articular surface of the radius (R) by the distance between the radius styloid process and the proximal ulnar corner of the lunate (P-Lu)[25].