Fig. 3

First ‘Negative’ cutting guide (top left) based on Moddaber et al. for medial osteotomy without crest and spine of the iliac bone in place. DCIA, transverse (TB), and ascending branch (AB) can be easily identified, as can the slot for the pedicle, including the AB (arrows). Second 2-part ‘Negative’ guide after the first part (bottom left) has been placed on the crista; the pedicle is ‘pulled through’ to be protected when the second part (bottom right) is placed