fig2

Figure 2. Showing the calculation of DCA and location of CORA. A: lateral fluoroscopy view of metacarpal; B: two lines were drawn. The first line was drawn from the base of the metacarpal, along the dorsal surface distally. The second line was drawn from the neck of the metacarpal, along the dorsal surface proximally. The point where these two lines meet was identified as the CORA. The angle between the two lines was taken as the DCA; C: the distance from the CORA to the metacarpal base was measured against the total length of the metacarpal to get the CORA ratio; DCA: dorsal cortical angle; CORA: center of rotation of angulation