title: Iliac crest orientation and geometry in able-bodied and non-treated adolescent idiopathic scoliosis girls with moderate and severe spinal deformity.
abstract: OBJECTIVE
  To identify pelvic rotation and/or distortion in able-bodied and untreated AIS girls with moderate and severe scoliosis and verify association of pelvic morphological changes with Cobb angle increase.
  
  
  METHODS
  The 3D coordinates of nine anatomic bony landmarks were identified to estimate pelvic orientation using a Flock of Birds system. The distances between the first sacral vertebral body (S1) and each of the eight iliac spine landmarks in all three planes were calculated to identify pelvic distortion. Analysis of variance was used to assess pelvic orientation and determine pelvic distortion. Pearson coefficients of correlation were used to identify any relationships between Cobb angle and pelvic morphological parameters.
  
  
  RESULTS
  Pelvic orientation was similar in able-bodied and scoliotic girls regardless of the severity of the spinal deformity. Significant differences were observed in pelvic morphology between AIS with severe untreated scoliosis and those with a moderate scoliosis for the right anterosuperior iliac spines (ASIS), the tip of the superior iliac crest (TSIC) and the widest tip of the iliac crest (WTIC) widths from S1. Statistically significant correlations were observed between the Cobb angles and the iliac crest distances measured from S1.
  
  
  CONCLUSIONS
  Differences in iliac spine geometries occurred in the transverse plane correlating to Cobb angles which suggest altered bone growth in AIS girls. Such findings could indicate right thoracic spinal deformity as a result of pelvic torsion.
authors.affiliation: Department of Exercise Science and Sport, John Long Center, University of Scranton, 800 Linden Street, Scranton, PA 18510, USA. gstylia@yahoo.com
authors.forename: Georgios A
authors.initials: GA
authors.lastname: Stylianides
authors.forename: Marléne
authors.initials: M
authors.lastname: Beaulieu
authors.forename: Georges
authors.initials: G
authors.lastname: Dalleau
authors.forename: Charles-Hilaire
authors.initials: CH
authors.lastname: Rivard
authors.forename: Paul
authors.initials: P
authors.lastname: Allard
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D002648:Child; D055590:Electromagnetic Phenomena; D005260:Female; D006801:Humans; D007085:Ilium / Q000473:pathology*; D021621:Imaging, Three-Dimensional; D012600:Scoliosis / Q000473:pathology*; D012720:Severity of Illness Index; D013121:Spinal Curvatures / Q000473:pathology*
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