title: [Second measurement of three-dimensional CT reconstruction data for scoliosis orthopaedic surgery].
abstract: OBJECTIVE
  To explore the clinical application and outcomes of preoperative second measurement of three-dimensional (3-D) CT reconstruction data for scoliosis orthopedic surgery.
  
  
  METHODS
  Between August 2006 and March 2008, 11 patients with severe rigid scoliosis received surgery treatment, including 4 males and 7 females with an average age of 17.2 years (range, 15-19 years). Preoperative second measurement of 3-D CT reconstruction data was conducted to guide the surgery, including the angle and width of pedicle, the entry point, and the choice of screws whose lengths and diameters were suitable. A total of 197 pedicle screws were implanted. The operation time, blood loss, postoperative nerve function, and Cobb's angles at sagittal and coronal view were all recorded, and the postoperative CT scan was performed to assess the accuracy of pedicle screw insertion according to Andrew classification.
  
  
  RESULTS
  Pedicle screws were implanted within 1-11 minutes (mean, 5.8 minutes), and the blood loss was 450-2 300 mL (mean, 1 520 mL). The postoperative X-ray films showed the correction rates of Cobb's angle were 68.5% in coronal view and 55.5% in sagittal view. The accuracy of pedicle screw insertion was rated as grade I in 77 screws (39.1%), grade II in 116 screws (58.9%), and grade III in 4 screws (2.0%) according to postoperative CT scan. All 11 cases were followed up 14 months to 2 years without any complications.
  
  
  CONCLUSIONS
  Preoperative second measurement of 3-D CT reconstruction data can make the surgery process easy and accurate in treatment of severe scoliosis.
authors.affiliation: Department of Orthopedic Surgery, the Shengjing Affiliated Hospital, China Medical University, Shenyang Liaoning, 110004, P R China.
authors.forename: Guoxin
authors.initials: G
authors.lastname: Jin
authors.forename: Wenli
authors.initials: W
authors.lastname: Guo
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.forename: Shaoqian
authors.initials: S
authors.lastname: Cui
authors.forename: Jingzhu
authors.initials: J
authors.lastname: Duan
authors.forename: Huan
authors.initials: H
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D001863:Bone Screws; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D009985:Orthopedics / Q000379:methods*; D012600:Scoliosis / Q000000981:diagnostic imaging* / Q000601:surgery*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult