Analysis of a radiographic parameter K-line tilt following adjacent two-level anterior cervical discectomy and fusion: a retrospective study

Table 2 Correlations between the changes of sagittal alignment parameters following adjacent two-level ACDF

		ΔT1s	ΔC2–7 lordosis	ΔSA	ΔC2–7 SVA	ΔK-line tilt	ΔNDI
ΔT1s	r	1	.428^*	.631^**	.235^*	.650^*	.620^*
ΔT1s	p		.037	.005	.047	.042	.086
ΔC2–7 lordosis	r	.428^*	1	.666^*	− .467^**	-.023	.102
ΔC2–7 lordosis	p	.037		.022	.009	.847	.382
ΔSA	r	.631^**	.666^*	1	− .121	.269^*	− .080
ΔSA	p	.005	.022		.312	.026	.592
ΔC2-7SVA	r	.235^*	− .467^**	− .121	1	.293^*	.645^*
ΔC2-7SVA	p	.047	.009	.312		.013	.048
ΔK–line tilt	r	.650^*	− .023	.269^*	.293^*	1	.702^**
ΔK–line tilt	p	.042	.847	.026	.013		.028
ΔNDI	r	.620^*	.102	− .080	.645^*	.702^**	1
ΔNDI	p	.086	.382	.592	.048	.028

T1s T1 slope, SVA sagittal vertical axis, SA segmental angle, NDI neck disability index
^*Correlation is significant at the p < 0.05 level (2-tailed)
^**Correlation is significant at the p < 0.01 level (2-tailed)

ISSN: 1749-799X