Table 2 Follow-up records of VAS, JOA scores, and C2–C7 cervical Cobb angle during the follow-up period

6.53 ± 1.59

3.70 ± 1.37*

2.17 ± 1.09*^∆

1.27 ± 0.98*^∆◊

0.87 ± 0.68*^∆◊#

5.37 ± 1.27

2.80 ± 1.27*

1.97 ± 0.89*^∆

1.43 ± 0.89*^∆◊

0.67 ± 0.61*^∆◊#

8.80 ± 1.99

12.50 ± 1.50*

13.53 ± 0.78*^∆

14.10 ± 0.76*^∆◊

14.40 ± 0.67*^∆◊#

10.58 ± 1.68

11.34 ± 1.44*

11.56 ± 1.39*^∆

11.83 ± 1.41*^∆◊

11.98 ± 1.31*^∆◊