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

Table 1 Comparison of surgical parameters between the two groups (n = 45)

Group	Surgical time (min)	Blood loss (mL)	Drainage volume (mL)	Length of hospital stay (d)
Control group	86.25 ± 13.46	46.03 ± 8.72	15.12 ± 2.67	14.69 ± 2.85
Observation group	88.17 ± 14.24	46.94 ± 8.83	16.03 ± 2.84	14.37 ± 2.74
t	0.657	0.492	1.566	0.543
P value	> 0.05	> 0.05	> 0.05	> 0.05

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.

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

Table 4 Comparison of complications between the two groups (n = 45)

Group	Dysphagia	Loosening of the internally fixed implant	Infection	Incidence, n (%)
Control group	3	3	1	7 (15.56)
Observation group	0	1	0	1 (2.22)
χ2	-	-	-	4.939
P value	-	-	-	< 0.05