Table 3 Comparative analysis of clinical parameters between the two groups

VAS for back, mean ± SD

Pre-OP

5.24 ± 1.44

5.34 ± 1.39

4.95–5.53

5.04–5.64

-0.45

0.65

Post-OP (1 month)

0.78 ± 0.83

0.75 ± 0.88

0.61–0.95

0.56–0.94

0.23

0.82

Post-OP (6 months)

0.28 ± 0.50

0.19 ± 0.40

0.18–0.38

0.10–0.28

1.28

0.20

Post-OP (2 years)

0.15 ± 0.36

0.13 ± 0.34

0.08–0.22

0.06–0.20

0.42

0.67

VAS for legs, mean ± SD

Pre-OP

6.54 ± 1.22

6.48 ± 1.23

6.29–6.79

6.22–6.74

-1.83

0.86

Post-OP (1 month)

1.10 ± 0.83

1.14 ± 0.93

0.93–1.27

0.94–1.34

-0.33

0.75

Post-OP (6 months)

0.26 ± 0.49

0.30 ± 0.54

0.16–0.36

0.20–0.40

-0.62

0.54

Post-OP (2 years)

0.22 ± 0.59

0.21 ± 0.44

0.10–0.34

0.12–0.30

0.12

0.91

ODI, mean ± SD

Pre-OP

60.93 ± 11.58

59.75 ± 11.93

58.49–63.37

57.07–62.43

-0.66

0.51

Post-OP (1 month)

14.19 ± 8.12

14.85 ± 7.93

12.62–15.76

13.15–16.55

-0.54

0.59

Post-OP (6 months)

10.81 ± 7.03

9.95 ± 5.50

9.45–12.17

8.73–11.17

0.90

0.37

Post-OP (2 years)

6.96 ± 4.68

6.23 ± 3.13

6.00–7.92

5.55–6.91

1.20

0.23

Modified MacNab criteria

Excellence

78

63

—

—

1.17

0.82

Good

11

13

—

—

Fair

2

1

—

—

Poor

3

2

—

—

Clinical efficacy classification

Excellence and good

89

76

—

—

0.23

0.73

Fair and poor

5

3

—

—

Complications

Tear of the Dural sac

2

1

—

—

1.18

0.98

Hematoma

1

2

Sensory abnormalities of the lower limbs

2

2

—

—

Recurrence

3

2

—

—