Long-term impact of sagittal malalignment on hardware after posterior fixation of the thoracolumbar spine: a retrospective study

Table 4 Radiographic measurement

	Revision cohort	Control cohort	p-values*	P-values Wald test
LL (°) mean ± SD	34.6 ± 20.3	43.4 ± 14.3	0.15	0.366
SS (°) mean ± SD	34.4 ± 10.2	30.8 ± 9.5	0.22	0.162
PT (°) mean ± SD	33.3 ± 9.6	23.5 ± 7.6	0.001	0.005
PI (°) mean ± SD	67.7 ± 14.7	54.7 ± 12.4	0.002	0.006
SVA (mm) mean ± SD	112.2 ± 64.8	67.1 ± 32.6	0.02	0.037
TK (°)mean ± SD	26.4 ± 16.7	30.6 ± 14.7	0.60	0.621
LG (°) mean ± SD	33.9 ± 19.5	11 ± 9.7	0.001	0.004
FOA Median / IQ range	8 ± 12	6 ± 6	0.7	0.357

*The mean values of PI, PT, SVA, and LG were significantly lower in controls than in the revision cohort (independent sample t-test). A multivariate binary logistic regression analysis (Wald test) showed significant differences in PT, PI, SVA, and LG between the revision cohort and controls

ISSN: 1471-2474