Table 5

Failures with iliac screw vs no iliac screws.

Mode of Failure	n	Iliac Screw (n = 70)	No Iliac Screw (n = 107)	P Value
Broken screw	2	2	0	0.0701
Screw loosening	5	2	3	0.6114
Symptomatic hardware prominence	6	2	4	0.6584
Set screw loosening	4^{^a}	4	0	0.0047
Rod fractures	6^{^b}	6	0	0.003
Total	23	16	7

Note: Boldface indicates stastistically significant findings at P < 0.05.
↵a Three of the set screw loosenings were asymptomatic. No revision required.
↵b Five rod fractures were asymptomatic with solid fusion on computed tomography image. No revision was needed.