title: [Application of computer navigation system in the treatment of post-traumatic reconstruction].
abstract: OBJECTIVE
  To investigate the value of computer aided navigation system (CANS) in the treatment of post traumatic maxillofacial deformation.
  
  
  METHODS
  Fifty-four patients (M = 37, F = 17) were included in the study, including 31 cases of zygomatic fracture, 7 cases of pure orbital fracture, 11 cases of temporal mandibular joint ankylosis, 1 case of foreign body and 4 cases of defect reconstruction with custom implant. Data acquisition was done through CT scan, and DICOM data was transferred into workstation. Computer assisted design, including osteotomy, reposition, fibula flap design, orbital implant construction was performed using Surgicase CMF and Brain Lab Iplan system. The virtual design was transferred to Brain Lab navigation system, and the osteotomy, reduction, location of bone graft and custom implant were guided by navigation. Postoperative CT scan was required 48 - 72 hours after surgery. Preoperative and postoperative CT images were superimposed automatically in BrainLab Iplan system, and compared both in 3D objects and 2D slices.
  
  
  RESULTS
  All the cases achieved good results without serious complication. The error of important corresponding points in zygomatic fracture reduction, orbital reconstruction and defect reconstruction was 0.2 - 3.5 mm, 0.8 - 2.0 mm and 0.2 - 2.2 mm respectively.
  
  
  CONCLUSIONS
  Computer assisted design is of considerable value for the systematic and accurate planning for complicated post traumatic deformation. Virtual plan could be carried out accurately with the assistance of CANS.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China.
authors.forename: Xiao-Jing
authors.initials: XJ
authors.lastname: Liu
authors.forename: Yang
authors.initials: Y
authors.lastname: He
authors.forename: Xi
authors.initials: X
authors.lastname: Gong
authors.forename: Jin-Gang
authors.initials: JG
authors.lastname: An
authors.forename: Chuan-Bin
authors.initials: CB
authors.lastname: Guo
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000328:Adult; D003198:Computer Simulation; D017076:Computer-Aided Design; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008297:Male; D009917:Orbital Fractures / Q000000981:diagnostic imaging / Q000601:surgery*; D019651:Plastic Surgery Procedures / Q000379:methods*; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed; D020254:Tooth Ankylosis / Q000000981:diagnostic imaging / Q000601:surgery*; D055815:Young Adult; D015051:Zygomatic Fractures / Q000000981:diagnostic imaging / Q000601:surgery*