Table 4.

Radiographic outcomes in double-level ACDF

Variables	Group A (n = 60)	Group B (n = 59)	P value
Fusion rate
3 months follow-up			0.03
No fusion	53	39
One-level fusion	4	9
Two-level fusion	3	11
6 months follow-up			0.01
No fusion	37	21
One-level fusion	11	15
Two-level fusion	12	23
1 year follow-up			0.048
No fusion	15	6
One-level fusion	20	17
Two-level fusion	25	36
Final follow-up			0.46
No fusion	3	1
One-level fusion	5	3
Two-level fusion	52	55
FSH (mm)
Preoperative	49.1 ± 4.5	48.9 ± 4.2	0.80
Postoperative	53.4 ± 4.9	52.7 ± 4.0	0.40
1 year follow-up	51.2 ± 4.1	51.0 ± 3.7	0.78
Final follow-up	50.5 ± 3.8	50.4 ± 3.6	0.88
Subsidence (mm)	2.9 ± 1.4	2.3 ± 0.8	0.01
Subsidence rate	17/60	10/59	0.14
C2-7 lordosis (°)
Preoperative	12.9 ± 10.8	11.0 ± 12.4	0.37
Postoperative	19.1 ± 11.5	18.4 ± 11.9	0.75
1 year follow-up	17.3 ± 13.4	16.9 ± 12.7	0.87
Final follow-up	15.4 ± 10.8	17.2 ± 12.4	0.40
SSA (°)
Preoperative	4.2 ± 5.4	3.9 ± 6.1	0.78
Postoperative	10.7 ± 6.1	9.3 ± 7.0	0.26
1 year follow-up	9.2 ± 5.3	8.6 ± 6.5	0.58
Final follow-up	8.5 ± 4.9	8.2 ± 5.7	0.76

FSH Fusion segmental height, SSA Segmental sagittal alignment