title: [Percutaneous pelvic fracture stabilization using CT-based 3D navigation software combined with targeting mechanical arm: a cadaver model trial].
abstract: OBJECTIVE
  To investigate a new targeting mechanical arm for CT-based navigated percutaneous fixation of pelvic fractures, and to evaluate the safety and efficiency of the procedures.
  
  
  METHODS
  Using CT-based 3D navigation software combined with targeting mechanical arm, percutaneous insertion of pelvic models (3 dry human cadaver pelvic skeletons and 5 plastic Sybone pelvic models) were performed, 8 pelvic models allowed percutaneous cannulated screw insertion of both S-I joint (2 S-I screws placement for each side, total 32 screws in this experiment) and both superior ramus (1 ramus medullary screw placement for each side, total 16 screws in this experiment). Percutaneous insertion of pelvic models (4 dry human cadaver pelvic skeletons and 4 plastic Sybone pelvic models, 1 S-I screws and 1 ramus medullary scre placement for each side, 32 screws in this experiment) were performed using fluoro-navigation system (Stryker, USA). Time necessary for every screw insertion were recorded. Accuracy of screw placement was assessed using C-arm imaging and direct eyes inspecting. The time and accuracy of the two methods were compared.
  
  
  RESULTS
  The time required for the CT-based 3D navigation procedure (3.6 ± 1.2) min was significantly less than using the targeting mechanical arm compared to drilling freehand with navigation (9.1 ± 0.8) min (t = 2.50, P < 0.01). There was no significant difference in accuracy between the two methods.
  
  
  CONCLUSIONS
  CT-based 3D navigation software combined with targeting mechanical arm should be potential to apply percutaneous sacroiliac screwing for pelvic fractures with more accurate and more reliable.
authors.affiliation: Department of Orthopaedics and Traumatology, Beijing Jishuitan Hospital, China. dr.junqiang2010@gmail.com
authors.forename: Jun-qiang
authors.initials: JQ
authors.lastname: Wang
authors.forename: Da
authors.initials: D
authors.lastname: Liu
authors.forename: Chun-peng
authors.initials: CP
authors.lastname: Zhao
authors.forename: Da-peng
authors.initials: DP
authors.lastname: Zhang
authors.forename: Yong-gang
authors.initials: YG
authors.lastname: Su
authors.forename: Wei
authors.initials: W
authors.lastname: Han
authors.forename: Tian-miao
authors.initials: TM
authors.lastname: Wang
authors.forename: Man-yi
authors.initials: MY
authors.lastname: Wang
mesh_terms: D001863:Bone Screws; D002102:Cadaver; D005593:Fracture Fixation, Internal / Q000379:methods*; D006801:Humans; D008953:Models, Anatomic; D010384:Pelvic Bones / Q000601:surgery*; D012984:Software; D025321:Surgery, Computer-Assisted / Q000379:methods*