Table 5 Effects of Sagittal Alignment Parameters on Adjacent Segment Degeneration After Cervical Disc Replacement

 CL (°)

15.9 ± 8.3

12.4 ± 12.4

0.189

16.3 ± 8.2

11.9 ± 10.7

0.048^a

 SA (°)

1.7 ± 4.5

−2.1 ± 5.4

0.006^a

1.8 ± 4.9

−1.2 ± 3.7

0.001^a

 SVA (mm)

17.0 ± 8.1

16.3 ± 4.8

0.740

16.7 ± 8.1

17.5 ± 6.1

0.609

 T1s (°)

28.0 ± 7.1

25.2 ± 3.9

0.020^a

28.2 ± 7.1

25.1 ± 5.4

0.034^a

 T1s-CL (°)

12.1 ± 7.4

12.8 ± 11.5

0.740

11.9 ± 8.0

13.3 ± 8.2

0.476

 CL (°)

13.1 ± 8.0

8.4 ± 9.3

0.026^a

13.3 ± 7.8

9.2 ± 9.2

0.018^a

 SA (°)

−2.2 ± 4.9

−4.0 ± 5.7

0.160

−1.8 ± 5.1

−4.8 ± 3.8

0.001^a

 SVA (mm)

16.9 ± 7.2

15.3 ± 6.5

0.482

16.5 ± 6.6

17.3 ± 8.9

0.665

 T1s (°)

23.2 ± 10.3

16.4 ± 10.1

0.004^a

24.0 ± 9.5

15.7 ± 11.5

< 0.001^a

 T1s-CL (°)

10.1 ± 11.6

8.0 ± 15.4

0.926

10.7 ± 11.5

6.5 ± 14.1

0.212