Table 2.

Clinical data of cervical ADR and ACDF groups

	ACDF	ADR	P value
Neck visual analogue scale (VAS)
Pre-operative VAS	5.4 ± 2.80	5.4 ± 3.67	0.962
Post-operative. VAS (1 year)	4.7 ± 2.71	2.4 ± 2.32	0.033
Post-operative VAS (>2 years)	4.2 ± 3.33	1.9 ± 2.17	0.084
Arm VAS
Pre-operative VAS	5.0 ± 2.86	5.0 ± 3.83	1.000
Post-operative VAS (1 year)	3.1 ± 2.85	1.9 ± 2.13	0.300
Post-operative VAS (>2 years)	3.6 ± 3.38	1.5 ± 1.64	0.150

ACDF anterior cervical discectomy and fusion, ADR artificial disc replacement