Table 3.

Correlation between the changes of sagittal alignment parameters following ACHDF

		△T1 s	△C2–7SVA	△C2–7 lordosis	△Cranial tilting	△Cervical tilting
△T1 s	r		0.118	0.334*	− 0.063	0.391**
	P		0.458	0.031	0.692	0.010
△C2–7SVA	r	0.118		−0.132	0.605**	− 0.218
	P	0.458		0.406	0.000	0.165
△C2–7 lordosis	r	0.334*	− 0.132		−0.310*	0.502*
	P	0.031	0.406		0.045	0.001
△Cranial tilting	r	−0.063	0.605**	− 0.310*		−0.622**
	P	0.692	0.000	0.045		0.000
△Cervical tilting	r	0.391**	− 0.218	0.502**	− 0.622**
	P	0.010	0.165	0.001	0.000

ACHDF, anterior cervical hybrid decompression and fusion; SVA, sagittal vertical axis; T1 s, T1 slope

*Correlation is significant at the P < 0.05 level (2-tailed);

**Correlation is significant at the P < 0.01 level (2-tailed)