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 | 4a | 4 | 0 | 0.0047 |
Rod fractures | 6b | 6 | 0 | 0.003 |
Total | 23 | 16 | 7 |
Note: Boldface indicates stastistically significant findings at P < 0.05.
aThree of the set screw loosenings were asymptomatic. No revision required.
bFive rod fractures were asymptomatic with solid fusion on computed tomography image. No revision was needed.