Table 3 Clinical outcome

ODI (%)^a

Pre op

57.1 ± 7.7

56.1 ± 8.1

0.391

Mid-term

33.5 ± 6.6

33.9 ± 7.1

0.738

Final

25.9 ± 5.7

24.9 ± 5.9

0.271

VAS_back (mm)^a

Pre op

43.7 ± 14.5

45.3 ± 13.9

0.451

Mid-term

19.5 ± 11.7

18.6 ± 11.3

0.633

Final

10.6 ± 9.1

11.4 ± 8.5

0.568

VAS_leg (mm)^a

Pre op

51.6 ± 15.7

52.3 ± 16.3

0.752

Mid-term

13.2 ± 8.9

11.5 ± 8.2

0.199

Final

6.7 ± 8.3

7.1 ± 7.5

0.782