Outcomes of cervical degenerative disc disease treated by anterior cervical discectomy and fusion with self-locking fusion cage

Table 3 Comparison of the cervical range of motion between the two groups (n = 45)

Group	Disc height (mm)		Range of motion of the superior adjacent vertebra (°)		Range of motion of the inferior adjacent vertebra (°)
	Preoperative	Postoperative	Preoperative	Postoperative	Preoperative	Postoperative
Control group	5.26 ± 0.72	7.24 ± 0.78	10.32 ± 2.64	15.28 ± 4.43	10.29 ± 2.56	15.37 ± 4.21
Observation group	5.31 ± 0.75	7.68 ± 0.85	10.38 ± 2.65	11.74 ± 2.96	10.33 ± 2.62	12.18 ± 3.15
t	0.323	2.559	0.108	4.457	0.073	4.070
P value	> 0.05	< 0.05	> 0.05	< 0.05	> 0.05	< 0.05