The change of cervical sagittal parameters plays an important role in clinical outcomes of cervical spondylotic myelopathy after multi-level anterior cervical discectomy and fusion

Table 2 Comparison of cervical sagittal parameters between group GO and group PO

	Total (n = 89)	Group GO (n = 54)	Group PO (n = 35)	t/z	p
Cobb angle (°)
Preoperative	11.80 ± 9.63	12.35 ± 9.75	10.94 ± 9.51	0.727	0.467
Last follow-up	15.08 ± 9.05	16.48 ± 9.18	12.91 ± 8.52	2.246	0.025
t/z	6.191	5.366	3.120
p	< 0.001	< 0.001	0.002
△Cobb angle (°)	3.28 ± 3.88	4.13 ± 4.11	1.97 ± 3.11	2.633	0.008
SVA (mm)
Preoperative	23.69 ± 11.69	23.52 ± 10.89	23.94 ± 12.98	0.166	0.868
Last follow-up	18.79 ± 10.78	16.76 ± 9.96	21.91 ± 11.39	2.168	0.030
t/z	6.484	6.385	2.338
p	< 0.001	< 0.001	0.019
△SVA (mm)	− 4.90 ± 6.30	− 6.76 ± 5.41	− 2.03 ± 6.57	2.629	0.009
T1S (°)
Preoperative	23.43 ± 11.78	24.69 ± 11.29	24.03 ± 12.65	0.332	0.740
Last follow-up	26.92 ± 11.94	27.31 ± 11.06	26.31 ± 13.32	0.235	0.814
t/z	4.712	4.627	2.759
p	< 0.001	< 0.001	0.006
△T1S (°)	2.49 ± 4.19	2.63 ± 4.18	2.29 ± 4.27	0.219	0.826
Cranial tilt
Preoperative	5.16 ± 6.47	5.31 ± 6.08	4.91 ± 7.11	0.332	0.740
Last follow-up	7.52 ± 6.27	7.80 ± 6.12	7.09 ± 6.56	0.450	0.653
t/z	6.651	5.850	3.471
P	< 0.001	< 0.001	0.001
△Cranial tilt	2.36 ± 2.25	2.48 ± 1.88	2.17 ± 2.74	0.060	0.952
Cervical tilt
Preoperative	17.71 ± 6.28	18.06 ± 6.12	17.17 ± 6.57	0.539	0.590
Last follow-up	17.46 ± 6.54	17.87 ± 6.56	16.83 ± 6.55	0.545	0.585
t/z	1.522	0.896	1.291
p	0.132	0.374	0.205
△Cervical tilt	− 0.25 ± 1.53	− 0.19 ± 1.52	− 0.34 ± 1.57	0.067	0.946

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