Table 3

Hardware failure (21 patients)—2-y follow-up.

Mode of Failure	n	Women	Men
Broken screw	2	1	1
Screw loosening	5	3	2
Symptomatic hardware prominence	6	4	2
Set Screw loosening	4^a	2	2
Rod fractures^c	6^b	4	2
Total	23	14	9

aThree of the set screw loosenings were asymptomatic. No revision required.
bFive rod fractures were asymptomatic with solid fusion on computed tomography scan. No revision.
cOne male patient had symptomatic T12- L1 and L5-S1 nonunion with bilateral distal rod fractures, iliac set screw loosening, and proximal T12 screw loosening.