Table 1 Patient Demographics

Patients, n

93

31

31

31

Age (years)

0.50

Mean

66.7

68.2

67.4

64.5

Range

40–90

43–83

42–90

40–89

Sex (n)

0.81

Male

44

16

15

13

Female

49

15

16

18

Duration of symptoms (months)

0.92

Mean

10.9

10.4

11.2

11.3

Range

3–24

4–18

3–24

4–22

Diagnosis, n (%)

0.83

Moderate to severe lumbar spinal stenosis

15 (16.1%)

7 (22.6%)

4 (12.9%)

4 (12.9%)

Mild spondylolisthesis (Grade I or II)

23 (24.7%)

6 (19.4%)

10 (32.3%)

7 (22.6%)

Giant herniated intervertebral disc with disc space narrowing

35 (37.6%)

13 (41.9%)

11 (35.5%)

11(35.5%)

Lumbar degenerative instability

11 (11.8%)

4 (12.9%)

3 (9.7%)

4 (12.9%)

Postoperative recurrence of lumbar disc herniation

4 (4.3%)

1 (3.2%)

1 (3.2%)

2 (6.5%)

Adjacent segmental disease

5 (5.4%)

0

2 (6.5%)

3 (9.7%)

Levels Fused, n (%)

0.01

L2-3

9 (9.7%)

2 (6.5%)

4 (12.9%)

3 (9.7%)

L3-4

22 (23.7%)

13 (41.9%)

2 (6.5%)

7 (22.6%)

L4-5

59 (63.4%)

16 (51.6%)

25 (80.6%)

18 (58.1%)

L2/3 + L3/4

1 (1.1%)

0

0

1 (3.2%)

L3/4 + L4/5

2 (2.2%)

0

0

2 (6.5%)