Fig. 2

Pelvic ring x-rays and a cystogram after repeated screw expulsion. Pelvic ring images AP [a] inlet [b] and outlet [c] views, obtained after the expulsion of the second screw (October 2009). The three projections show five screws remaining compared to the seven screws which had been placed initially (compare with Fig. 2). Two 6.5 mm cancellous screws are present. All five remaining screws have loosened as seen in the three views. The position of the washer on the S1 iliosacral screw has changed and is no longer flush to the outer iliac cortex. These changes indicate that the 7.3 mm screw has also loosened when compared to its original position. A cystogram view [d] shows the contrast material adjacent to the posterior 4.5 mm DCPlate with its two 6.5 cancellous screws