Fig. 2From: Technical variation of trans-articular sacroiliac joint (SIJ) fusion using three screws considering the effects of sacral dysplasia in patients with non-traumatic SIJ painEntry points for the proximal-to-distal and anterior-to-posterior distances for three screws. The safety margin from each screw to the margin of the SIJ is marked with green lines, and that to the margin of the corresponding anterior margin of the sacrum is marked with blue linesBack to article page