title: Pedicle morphology of the thoracic and lumbar spine in scoliosis associated with Chiari malformation/syringomyelia: comparison with adolescent idiopathic scoliosis.
abstract: OBJECTIVE
  To investigate the morphology of pedicle in thoracic and lumbar spine in scoliosis associated with Chiari malformation/Syringomyelia-comparison with adolescent idiopathic scoliosis (AIS).
  
  
  METHODS
  Twenty-three patients of Lenke type 1 AIS and 21 patients of scoliosis associated with Chiari malformation/Syringomyelia with the similar curve type to Lenke 1 AIS underwent preoperational computed tomographic scans. Anatomic parameters were measured from T1 to L4, which included pedicle width, transverse pedicle angle, and chord length. Statistical comparison was performed within and between 2 groups.
  
  
  RESULTS
  Pedicle width of patients with scoliosis associated with Chairi malformation/Syringomyelia ranged from 3 to 10.9 mm; pedicle width of convex side was wider than concave side in apex region and upper end vertebrae region (P<0.05), whereas in some thoracolumbar vertebrae(T11,L1,L3), pedicle width of concave side was wider than convex side (P<0.05). No statistical distinction was found between convex and concave side both in pedicle angle and chord length in scoliosis associated with Chiari malformation/Syringomyelia (P≥0.05), except several vertebrae. Statistic comparison between 2 groups showed no significance for the difference values of convex and concave pedicle width, transverse angle, and chord length (P≥0.05), except several vertebrae (T8, T12). Although the mean value of pedicle width of scoliosis associated with Chiari malformation/Syringomyelia was smaller than of AIS in every vertebra, statistical comparison showed no significance.
  
  
  CONCLUSIONS
  The morphology of pedicle in scoliosis associated with Chiari Malformation/Syringomyelia was substantially different form normal, especially in apex region, where the change is similar to AIS; however, in thoracolumbar region, pedicle width of concave side was wider than convex side in several vertebrae. Alternative pattern was similar between 2 groups for both transverse pedicle angle and chord length.
authors.affiliation: Department of Spine, Provincial Hospital Affiliated to Shandong University, No. 324 Jingwuweiqi road, Jinan City, Shandong, China.
authors.forename: Guodong
authors.initials: G
authors.lastname: Wang
authors.forename: Jianmin
authors.initials: J
authors.lastname: Sun
authors.forename: Xingang
authors.initials: X
authors.lastname: Cui
authors.forename: Zhensong
authors.initials: Z
authors.lastname: Jiang
mesh_terms: D000293:Adolescent; D001139:Arnold-Chiari Malformation / Q000000981:diagnostic imaging* / Q000473:pathology; D002648:Child; D005260:Female; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging*; D008297:Male; D008953:Models, Anatomic; D015203:Reproducibility of Results; D012600:Scoliosis / Q000000981:diagnostic imaging* / Q000473:pathology; D012680:Sensitivity and Specificity; D013595:Syringomyelia / Q000000981:diagnostic imaging* / Q000473:pathology; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed; D055815:Young Adult