Table 3 Clinical efficacy indices of the two groups of patients (x ± s)

VAS-Back

Preoperative

5.5 ± 0.8

5.7 ± 0.7

− 1.268

7 days postoperatively

2.0 ± 0.7*

2.1 ± 0.6*

− 0.725

3 months postoperatively

0.6 ± 0.5*

0.8 ± 0.6*

− 1.819

Last follow-up

0.3 ± 0.4*

0.4 ± 0.5*

− 0.914

VAS-Leg

Preoperative

6.6 ± 0.9

6.9 ± 1.0

− 1.248

7 days postoperatively

1.7 ± 0.7*

1.6 ± 0.6*

0.947

3 months postoperatively

0.5 ± 0.6*

0.7 ± 0.6*

− 1.135

Last follow-up

0.3 ± 0.4*

0.3 ± 0.5*

− 0.485

ODI score

Preoperative

37.6 ± 2.3

36.7 ± 2.4

1.353

3 months postoperatively

25.0 ± 2.3*

24.4 ± 1.9*

1.134

Last follow-up

8.9 ± 1.6*

8.8 ± 1.2*

0.337

JOA score

Preoperative

11.5 ± 1.7*

11.8 ± 1.8*

− 0.585

1 year postoperatively

22.2 ± 1.4*

21.8 ± 1.3*

1.069

Last follow-up

24.7 ± 1.2*

24.4 ± 1.4*

1.003

Bridwell(I/II)

18/6

27/12

χ2 = 0.242