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Table 1 Parameters of sagittal spino-pelvic alignment

From: Spinal sagittal imbalance in patients with lumbar disc herniation: its spinopelvic characteristics, strength changes of the spinal musculature and natural history after lumbar discectomy

Parameter Abbreviation Descriptions
C7 plumb line- sagittal vertical axis (cm) C7PL-SVA Horizontal distance between the posterior corner of the sacrum and the C7 plumb linea
Trunk shift (cm) Trunk shift Horizontal distance between the C7 plumb line and the Center Sacral Vertical Lineb
Thoracic kyphosis (°) TK Cobb angle method between T5 and T12
Lumbar lordosis (°) LL Cobb angle method between L1 and S1
Pelvic incidence (°) PI Angle between the perpendicular line from the sacral plate and the line connecting the midpoint of the sacral plate to the bicoxofemoral axis
Pelvic tilt (°) PT Angle between the line connecting the midpoint of the sacral plate to the bicoxofemoral axis and the vertical plane
Sacral slope (°) SS slope angle between superior endplate of S1 and horizontal line
  1. aValue is considered negative when the C7 plumb line is posterior to the posterior corner of the sacrum
  2. bValue is considered negative when the C7 plumb line is left to the Center sacral vertical line