Table 2 Comparison of the parameters between non-fusion group and fusion group

Age (years)

22.0 ± 7.7

21.0 ± 6.2

0.410

0.684

Sex

Male:15

Male:69

0.861

0.354

Female:4

Female:32

Follow-up time (months)

18.4 ± 10.1

25.9 ± 12.0

-1.657

0.103

BMI

22.9 ± 3.7

23.9 ± 3.1

-0.841

0.404

LL(°)

54.5 ± 10.6

52.9 ± 11.3

0.370

0.713

SS(°)

41.4 ± 5.5

40.9 ± 7.2

0.154

0.878

PT(°)

10.5 ± 6.5

11.9 ± 5.8

-0.620

0.538

PI(°)

51.8 ± 8.6

52.8 ± 8.5

-0.334

0.739

Spondylolisthesis

68.4%

48.5%

2.538

0.111

SBO

31.6%

5.9%

9.005

0.003

Stage of the defect

Stage I:0%

Stage I:11.9%

39.798

< 0.001

Stage II: 10.5%

Stage II: 70.3%

Stage III: 89.5%

Stage III: 17.8%

Disc degeneration

Grade I: 5.3%

Grade I: 36.6%

11.846

0.003

Grade II: 52.6%

Grade II: 47.5%

Grade III: 42.1%

Grade III: 13.9%

Width of the defect (mm)

4.3 ± 1.8

1.9 ± 1.0

5.809

< 0.001

Site of the defect

0.54 ± 0.10

0.55 ± 0.14

-0.573

0.568

Angle of the defect (°)

16.5 ± 12.4

15.6 ± 11.9

0.290

0.773