Is the fusion order of the cranial and caudal levels different in two-level anterior cervical discectomy and fusion for cervical spondylopathy? A retrospective study

Table 2 Influential factors of the fusion rate between the fusion and non-fusion groups in 236 levels during the follow-up

		3 months			6 months			12 months			Last FU
		Fusion	Non-fusion	p	Fusion	Non-fusion	p	Fusion	Non-fusion	p	Fusion	Non-fusion	p
Relative position	Cranial levels	31 (26.27%)	87 (73.72%)	0.0024	69 (58.47%)	49 (41.53%)	0.0191	102 (86.44%)	16 (13.56%)	0.4739	109 (92.37%)	9 (7.63%)	0.6484
Relative position	Caudal levels	12 (10.17%)	106 (89.83%)	0.0024	50 (42.37%)	68 (57.63%)	0.0191	97 (82.20%)	21 (17.80%)	0.4739	106 (89.83%)	12 (10.17%)	0.6484
PRE-segment slope (°)		15.47 ± 4.787	18.42 ± 4.962	0.0005	16.69 ± 4.356	19.06 ± 5.406	0.0003	17.38 ± 4.704	20.67 ± 5.942	0.0002	17.57 ± 4.756	21.20 ± 6.702	0.0016
PRE-ROM (°)		6.604 ± 3.044	7.224 ± 3.841	0.3225	6.860 ± 3.327	7.366 ± 4.062	0.2957	7.056 ± 3.582	7.408 ± 4.381	0.5972	7.058 ± 3.679	7.658 ± 4.074	0.4802
PRE-disk height (mm)		4.71 ± 1.29	4.66 ± 1.09	0.7929	4.71 ± 1.17	4.62 ± 1.09	0.5395	4.70 ± 1.02	4.50 ± 1.00	0.3137	4.67 ± 1.15	4.68 ± 0.96	0.9753

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