Spinopelvic parameters

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  • Pelvic tilt (PT) - angle b/w vertical reference line (femoral head) & midpoint of sacral end plate 
  • Sacral slope (SS) - angle b/w sacral end plate & horizontal reference line 
  • Pelvic incidence (PI) - angle b/w perpendicular line of the sacral end plate & center of femoral head


  • PI = SS + PT
  • PI תמיד קבוע
    • if ↑PT → ↓SS;
    • if ↓PT → ↑SS;

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