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

Table 2 Comparison of pain and cervical spine function between the two groups (n = 45)

Group	VAS score		JOA score		NDI (%)
	Preoperative	Postoperative	Preoperative	Postoperative	Preoperative	Postoperative
Control group	5.42 ± 1.06	1.95 ± 0.48	8.94 ± 2.18	13.26 ± 3.35	33.82 ± 6.43	14.56 ± 2.84
Observation group	5.38 ± 1.05	1.03 ± 0.29	9.03 ± 2.19	18.71 ± 3.62	33.79 ± 6.36	8.92 ± 2.33
t	0.180	11.005	0.195	7.412	0.022	10.299
P value	> 0.05	< 0.05	> 0.05	< 0.05	> 0.05	> 0.05

VAS: Visual analogue scale; JOA: Japanese Orthopedic Association; NDI: Neck disability index.