Table 1 Preoperative data of two groups

No

34

28

Age (mean)

82.29 ± 1.9

82.14 ± 2.05

Gender

 Female

20

20

 Male

14

8

BMD (SD)

− 1.67 ± 0.92

− 1.5 ± 0.72

Duration (years)

3.11 ± 1.23

3.09 ± 1.16

CCI

1.91 ± 0.87

1.89 ± 0.63

ASA

2.85 ± 0.36

2.68 ± 0.48

Stenosis degree

 Moderate

23

15

 Severe

11

13

Treatment level

 L1/2

1

1

 L2/3

2

3

 L3/4

3

1

 L4/5

21

15

 L5/S1

7

8

Pre-VAS

7.32 ± 0.91

7.18 ± 0.90

Pre-ODI

51.66 ± 10.74

49.29 ± 9.63

Pre-JOA

11.56 ± 3.40

11.68 ± 3.10