Table 5.

Univariate Risk Factors for Predicting Clinical Adjacent Segment Pathology requiring Surgery in Patients with C5/6 Level Fusion (n=54)

Risk Factor	OR (95% CI) unit=5	p value	c-index
Distance from fusion mass to C2 plumb line	1.312 (0.894, 1.925)	0.166	0.637
Distance from fusion mass to C7 plumb line	2.463 (1.143, 5.304)	0.021	0.683
Distance from C2 to C7 sagittal plumb line	1.345 (0.993, 1.821)	0.055	0.670
C7 sagittal slope angle	1.481 (1.016, 2.157)	0.041	0.669
T1 sagittal slope angle	1.469 (0.993, 2.173)	0.055	0.661
Caudally adjacent disc angle	0.901 (0.433, 1.875)	0.781	0.535
Alignment of the fusion mass	0.963(0.649, 1.428)	0.850	0.519
Overall cervical sagittal alignment	0.884 (0.692, 1.129)	0.322	0.587
Straight vs. Lordosis	2.190 (0.657, 7.285)	0.202	0.581

Note: c-index, usually 0.90–1 = excellent, 0.80–0.90 = good, 0.70–0.80 = fair, 0.60–0.70 = poor, 0.50–0.60 = fail