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Table 1 Characteristic of patients

From: Risk factors for screw loosening in patients with adult degenerative scoliosis: the importance of paraspinal muscle degeneration

Parameters Value
Age (year) 63.5 ± 5.8
Gender
 Male 21
 Female 72
BMI (kg/m2) 25.8 ± 4.2
Lumbar T value − 0.9 ± 1.5
Follow-up time (months) 38.4 ± 16.0
Blood loss (ml) 1156.6 ± 659.4
Operation time (min) 270.4 ± 61.9
Hospital stay (days) 12.6 ± 6.9
Number of fused segments 5.5 ± 1.3
Proximal fixation segment (%)
 T8-10 14 (15.1)
 T11-L1 65 (69.9)
 L2 14 (15.1)
Distal fixation segment (%)
 Sacrum fixation 56 (60.2)
 Non-sacrum fixation 37 (39.8)
Screw loosening (%)
 Loosening 59 (63.4)
 Non-loosening 34 (36.6)
Cobb angle (°) 25.9 ± 9.6
Sagittal parameters
 SVA (mm) 55.7 ± 38.7
 PI (°) 48.1 ± 10.5
 PT (°) 23.6 ± 10.3
 SS (°) 24.5 ± 9.6
 LL (°) 25.5 ± 15.8
 TK (°) 21.0 ± 12.3
 PI-LL (°) 22.6 ± 16.0
  1. BMI body mass index, SVA sagittal vertical axis, PI pelvic incidence, PT pelvic tilt, SS sacral slope, LL lumbar lordosis, TK thoracic kyphosis, PI-LL PI minus LL