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. 2020 Apr 15;47(6):1687–1698. doi: 10.1007/s00068-020-01362-9

Fig. 3.

Fig. 3

Bone area for iliosacral screw placement has the form of a diabolo with the vestibule being its marrowest passage. It is consistently ovoid in shape and extends from the roof of the S1 neuroforamen to the alar slope. The vestibule always points towards anterior and superior (from Carlson et al. [22])