title: Computer-aided volume measurement of posttraumatic orbits reconstructed with AO titanium mesh plates: accuracy and reliability.
abstract: OBJECTIVE
  To prospectively evaluate the accuracy and reliability of "freehand" posttraumatic orbital wall reconstruction with AO (Arbeitsgemeinschaft Osteosynthese) titanium mesh plates by using computer-aided volumetric measurement of the bony orbits.
  
  
  METHODS
  Bony orbital volume was measured in 12 patients from coronal CT scan slices using OsiriX Medical Image software. After defining the volumetric limits of the orbit, the segmentation of the bony orbital region of interest of each single slice was performed. At the end of the segmentation process, all regions of interest were grouped and the volume was computed. The same procedure was performed on both orbits, and thereafter the volume of the contralateral uninjured orbit was used as a control for comparison.
  
  
  RESULTS
  In all patients, the volume data of the reconstructed orbit fitted that of the contralateral uninjured orbit with accuracy to within 1.85 cm3 (7%).
  
  
  CONCLUSIONS
  This preliminary study has demonstrated that posttraumatic orbital wall reconstruction using "freehand" bending and placement of AO titanium mesh plates results in a high success rate in re-establishing preoperative bony volume, which closely approximates that of the contralateral uninjured orbit.
authors.affiliation: Division of Oral and Maxillofacial Surgery, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland. paolo.scolozzi@hospvd.ch
authors.forename: Paolo
authors.initials: P
authors.lastname: Scolozzi
authors.forename: Bertrand
authors.initials: B
authors.lastname: Jaques
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001860:Bone Plates; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D013508:Ophthalmologic Surgical Procedures; D009915:Orbit / Q000000981:diagnostic imaging* / Q000601:surgery; D009917:Orbital Fractures / Q000601:surgery*; D011446:Prospective Studies; D019651:Plastic Surgery Procedures / Q000379:methods*; D015203:Reproducibility of Results; D014025:Titanium; D014057:Tomography, X-Ray Computed
chemical_list: D014025:Titanium