title: Global Sagittal Imbalance Due to Change in Pelvic Incidence After Traumatic Spinopelvic Dissociation.
abstract: OBJECTIVE
  To examine how spinopelvic morphology changes after traumatic spinopelvic dissociation and whether these changes affect the sagittal balance of the spine.
  
  
  METHODS
  Retrospective analysis.
  
  
  METHODS
  Level I trauma center.
  
  
  METHODS
  Thirty-nine consecutive patients who were diagnosed with traumatic spinopelvic dissociation and had a minimum 2-year radiological follow-up were included.
  
  
  METHODS
  Nineteen patients underwent spinopelvic pedicle screw fixation, 11 patients underwent percutaneous iliosacral screw fixation, and 9 patients were treated conservatively.
  
  
  METHODS
  The main outcome measurements are as follows: (1) injury morphology (injury type and kyphotic angulation) at the initial and follow-up visits; (2) sagittal vertical axis (SVA) at the 2-year follow-up; (3) spinopelvic parameters [pelvic incidence (PI), sacral slope, pelvic tilt, lumbar lordosis, and thoracic kyphosis] at the 2-year follow-up; and (4) bodily pain and Oswestry Disability Index at the 2-year follow-up.
  
  
  RESULTS
  There were 21 men and 18 women, with a mean age of 28.3 years (15-62 years). At the 2-year follow-up, the mean SVA was 5.4 ± 4.1 cm and the mean PI was 76.9 ± 24.6 degrees. Factors related to SVA after traumatic spinopelvic dissociation were PI (r = 0.441, P = 0.017), pelvic tilt (r = 0.387, P = 0.038), and injury type of complete displacement (r = 0.372, P = 0.047). The bodily pain and Oswestry Disability Index was significantly poorer in patients with SVA modifier "+" than in patients with SVA modifier "0."
  
  
  CONCLUSIONS
  Lumbosacral kyphosis after traumatic spinopelvic dissociation increases PI, which can affect the sagittal balance of the spine and clinical outcome. Restoration of lumbosacral orientation is important for preventing sagittal imbalance.
  
  
  METHODS
  Prognostic Level IV. See Instructions for Authors for a complete description of levels of evidence.
authors.affiliation: Department of Orthopaedic Surgery, Ajou University School of Medicine, Suwon, Republic of Korea.
authors.forename: Han-Dong
authors.initials: HD
authors.lastname: Lee
authors.forename: Chang-Hoon
authors.initials: CH
authors.lastname: Jeon
authors.forename: Suk-Hyeong
authors.initials: SH
authors.lastname: Won
authors.forename: Nam-Su
authors.initials: NS
authors.lastname: Chung
mesh_terms: D000293:Adolescent; D000328:Adult; D001863:Bone Screws; D005260:Female; D005593:Fracture Fixation, Internal; D006801:Humans; D015994:Incidence; D008159:Lumbar Vertebrae / Q000293:injuries; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000293:injuries*; D011183:Postoperative Complications / Q000453:epidemiology*; D012189:Retrospective Studies; D012447:Sacrum / Q000293:injuries*; D013121:Spinal Curvatures / Q000453:epidemiology*; D016103:Spinal Fractures / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D055815:Young Adult