Table 4 Preoperative radiographic outcome

ROM (°)^a

Operated level

6.8 ± 2.7

6.6 ± 3.0

0.579

L1–S1

18.1 ± 5.9

17.9 ± 6.4

0.852

Anterior disc height (mm)^a

Operated level

12.3 ± 2.4

12.3 ± 2.1

0.796

L1–S1

56.6 ± 4.9

56.7 ± 4.9

0.798

Posterior disc height (mm)^a

Operated level

7.7 ± 1.8

7.8 ± 1.2

0.774

L1–S1

36.3 ± 7.2

36.2 ± 4.5

0.911