Fig. 3From: Technical variation of trans-articular sacroiliac joint (SIJ) fusion using three screws considering the effects of sacral dysplasia in patients with non-traumatic SIJ painMaximal screw length (a) for the iliac and sacral bones (total screw length, TL) and just the sacrum (sacral screw length, SL). Section A indicates the proximal screw fixation, and section B indicates the middle screw fixation. Green lines indicate the safety margins to the lateral margin of the sacral canal and the anterior margin of the sacrum and foramen. Screws with certain length (within mean maximal length) used in (b) non-dysplastic sacrum (c) dysplastic sacrumBack to article page