Abstract ID: 26-329
Three-Dimensional Analysis of Asymmetry in the Orbits
Author: Dong Gyu Kim Base Hospital / Institution: Department of Plastic and Reconstructive Surgery, Soonchunhyang University, Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Republic of Korea
Presentation Type: ePoster Presentation
Purpose
Accurate orbital reconstruction requires restoration of three-dimensional anatomy, yet intra-operative assessment remains challenging. Mirroring technology is widely used in computer aided design to generate patient-specific templates based on the assumption of bilateral symmetry. However, the validity of this assumption in orbital anatomy has not been fully established. This study aimed to evaluate three-dimensional symmetry of the orbit and determine the reliability of mirroring technology for surgical application.
Methods
Computed tomography data from 104 patients were analyzed using iPlan Cranial software platform. Four anatomical reference points (Zygomatico-Frontal suture, Fronto-Maxillary suture, Infraorbital foramen, and optic canal were defined, and three-dimensional distances from these landmarks to the anterior nasal spine were measured bilaterally. Orbital cavity volume and inter-landmark distances from the optic canal were also assessed. Measurements were independently performed by three surgeons, and interobserver reliability was analyzed.
Results
No significant differences were found in three-dimensional distances between bilateral reference points, demonstrating high symmetry of orbital location. Absolute differences between sides were small, with all 95% confidence intervals within 1.4 millimeter. Orbital cavity volume showed a statistically significant but clinically negligible asymmetry (mean difference 0.85 ± 0.60 milliliter). Distances between the optic canal and orbital landmarks also showed no significant bilateral differences. Interobserver reliability was excellent across all measurements.
Conclusion
Orbital anatomy demonstrates a high degree of three-dimensional symmetry, supporting the reliability of mirroring technology in orbital reconstruction. This technique provides a practical and reproducible foundation for computer aided surgical planning and may improve accuracy in complex orbital reconstruction.
Additional Authors
| First name | Last name | Base Hospital / Institution |
|---|---|---|
| Ho Seong | Shin | Department of Plastic and Reconstructive Surgery, Soonchunhyang University, Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Republic of Korea |
| Juna | Shin | Department of Statistics, College of Literature, Science, and the Arts, University of Michigan, Ann Arbor, MI, USA |