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Table 3 Demographic characteristics and preoperative radiological findings and clinical scores

From: Improving effect of microendoscopic decompression surgery on low back pain in patients with lumbar spinal stenosis and predictive factors of postoperative residual low back pain: a single-center retrospective study

 

Postoperative VAS for LBP ≥ 25 mm (n = 98)

Postoperative VAS for LBP < 25 mm (n = 104)

P-value

Age (years)

72.3 ± 9.1

72.6 ± 9.0

0.845

Sex

  

0.034*

 Male

45.9%

61.5%

 

 Female

54.1%

38.5%

 

BMI (kg/m2)

24.9 ± 4.0

24.1 ± 3.7

0.141

Disease period (months)

33.4 ± 33.2

31.4 ± 32.6

0.681

Number of levels

  

0.645

 1

55.1%

49.0%

 

 2

33.7%

36.5%

 

 ≥ 3

11.2%

14.4%

 

Preoperative radiological findings

 Spondylolisthesis

  ≥ Grade 1

46.9%

50.0%

0.675

  ≥ Grade 2

8.2%

3.9%

0.241

 Scoliosis

13.3%

1.9%

0.003*

 Spinal instability

18.4%

17.5%

1.000

 Disk degeneration

  Grades 1, 2, 3

7.1%

8.7%

0.797

  Grade 4

59.2%

62.5%

0.667

  Grade 5

33.7%

28.9%

0.544

 Modic endplate changes

  Type 1

21.4%

3.9%

< 0.001*

  Type 2

7.1%

14.4%

0.116

  Type 3

2.0%

0%

0.234

 Vacuum phenomenon of disc space

68.4%

64.4%

0.653

 Old vertebral fractures

12.2%

10.6%

0.826

 Sagittal parameters

  PI-LL ≥ 10°

62.9%

60.6%

0.773

  PI-LL ≥ 20°

37.1

31.7%

0.459

  SVA ≥ 40 mm

61.2%

63.5%

0.773

  SVA ≥ 95 mm

21.4%

18.3%

0.600

  PT ≥ 20°

60.8%

51.0%

0.201

  PT ≥ 30°

24.7%

15.4%

0.113

Preoperative clinical scores

 VAS for low back pain

70.1 ± 15.9

63.4 ± 15.3

0.003*

 VAS for LBP ≥ 70 mm

55.1%

31.7%

0.001*

 VAS for leg pain

64.2 ± 24.0

63.4 ± 20.1

0.795

 VAS for leg numbness

65.2 ± 27.9

61.4 ± 25.2

0.315

  1. Values are presented as means and standard deviations or percentages
  2. *p < 0.05
  3. LBP Low back pain, BMI Body mass index, PI-LL Pelvic incidence minus lumbar lordosis, SVA Sagittal vertical axis, PT Pelvic tilt, VAS Visual analog scale