Fig. 1A–B.

(A) A pelvic specimen from the cemented group is shown after implant removal The intact posterior sacroiliac ligaments serve as a hinge behind the created fracture. (B) The anterior wall of S1 has been removed to show the cement envelope around the screw (Original magnification, ×4). The addition of cement increases the diameter of the screw and thereby limits the space between the implant and cortical borders of the sacrum.