Table 1.

Radiological data of cervical ADR and ACDF groups

	ACDF	ADR	P value
Sagittal balance (SB)
Pre-operative SB	15.6 ± 39.69	−13.0 ± 36.45	0.062
Post-operative SB (1 year)	11.2 ± 32.73	−8.6 ± 22.83	0.142
Post-operative SB (>2 years)	6.0 ± 19.54	−0.9 ± 17.78	0.489
Cervical lordosis (CL)
Pre-operative CL	−9.7 ± 9.00	−6.1 ± 8.71	0.326
Post-operative CL (1 year)	−7.3 ± 8.05	−10.1 ± 8.95	0.439
Post-operative CL (>2 years)	−6.7 ± 7.24	−16.7 ± 6.32	0.011
Thoracic kyphosis (TK)
Pre-operative TK	27.6 ± 10.07	21.6 ± 9.60	0.142
Post-operative TK (1 year)	23.2 ± 10.95	25.0 ± 10.29	0.726
Post-operative TK (>2 years)	19.5 ± 11.09	34.0 ± 9.06	0.012
Lumbar lordosis (LL)
Pre-operative LL	−42.1 ± 22.08	−42.3 ± 10.32	0.983
Post-operative LL (1 year)	−41.2 ± 8.93	−50.5 ± 9.37	0.043
Post-operative LL (>2 years)	−44.2 ± 10.52	−46.7 ± 11.04	0.649

ACDF anterior cervical discectomy and fusion, ADR artificial disc replacement