Should virtual mirroring be used in the preoperative planning of an orbital reconstruction?

Publication date: Available online 9 October 2017
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Jesper Jansen, Leander Dubois, Ruud Schreurs, Peter J.J. Gooris, Thomas J.J. Maal, Ludo F. Beenen, Alfred G. Becking
PurposeMirroring has been used as a diagnostic tool in orbital wall fractures for many years, but limited research is available proving the assumed symmetry of orbits. The purpose of this study was to evaluate volume and contour differences between orbital cavities in healthy humans.Materials and MethodsIn this cross-sectional study, the left and right orbital cavities of a consecutive sample of patients' CT scans were used. Inclusion criteria were patients with no sign of orbital/sinus pathology or fracture. The outcome variables were differences in volume and contour. Descriptive statistics and the paired student's t-test were used for data analysis of orbital volume and distance maps were used for analysis of the orbital contour.ResultsThe sample was composed of 100 subjects with a mean age of 57; 50% were male. The total mean orbital volume was 27.53 ± 3.11 mL. Mean difference between both cavities was 0.44 ± 0.31 mL or 1.59% (SD 1.10%). The orbital contour showed high similarity, with an absolute mean left-right difference of 0.82mm (SD 0.23).ConclusionThe investigators hypothesize that the measured differences between right and left orbital volume and contour are clinically insignificant. Consequently, the use of mirroring tools as part of preoperative planning in orbital reconstruction is legitimate with the aim of simulating the pre-traumatized anatomy.



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