2D- and 3D-based measurements of orbital floor fractures from CT scans

Oliver Ploder, Clemens Klug, Werner Backfrieder, Martin Voracek, Christian Czerny, Manfred Tschabitscher

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


Objective: Two methods for area and volume calculation of the orbit were evaluated following blow-out fractures of the orbital floor using computed tomography (CT) scans. Material and Methods: Isolated blow-out fractures of the orbital floor in human cadavers were simulated by fracturing the orbital floor and placing a defined volume of silicone within each defect. The area of fracture and the volume of silicone simulating herniated periorbital tissue were evaluated in 16 orbits by the use of a three-dimensional (3D) CT-based software package (Analyze®; Mayo Clinic, Rochester, MN, USA) and software based on two-dimensional (2D) coronal CT scans. Both methods were compared with direct anatomical measurements and evaluated with Lin's concordance coefficient (ρc). Results: Between-method concordance of area and volume calculation were ρc=0.962, and 0.872 for the 3D-CT-based method, and 0.981 and 0.952 for the 2D-CT method, respectively. The time allocated for measurement was significantly longer for the 3D-CT than for the 2D-CT method (p<0.001). Conclusion: Calculations of blow-out fractures of the orbital floor by 3D-CT and 2D-CT method are accurate for assessing the area of fracture and the volume of herniated tissue. Lesser processing time and simple usage favour the 2D-CT-based calculation method.

Original languageEnglish
Pages (from-to)153-159
Number of pages7
JournalJournal of Cranio-Maxillofacial Surgery
Issue number3
Publication statusPublished - Jun 2002
Externally publishedYes


  • Cadaver
  • Cephalometry/methods
  • Hernia/diagnostic imaging
  • Humans
  • Image Processing, Computer-Assisted/methods
  • Imaging, Three-Dimensional/methods
  • Orbital Diseases/diagnostic imaging
  • Orbital Fractures/diagnostic imaging
  • Reproducibility of Results
  • Software
  • Statistics as Topic
  • Tomography, X-Ray Computed/methods


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