Arch Plast Surg.  2017 Jan;44(1):26-33. 10.5999/aps.2017.44.1.26.

Correlation between the 2-Dimensional Extent of Orbital Defects and the 3-Dimensional Volume of Herniated Orbital Content in Patients with Isolated Orbital Wall Fractures

• Cha JH
• Moon MH
• Lee YH
• Koh IC
• Kim KN
• Kim CG
• Kim H

• KMID: 2403895
• DOI: http://doi.org/10.5999/aps.2017.44.1.26

Abstract

BACKGROUND
The purpose of this study was to assess the correlation between the 2-dimensional (2D) extent of orbital defects and the 3-dimensional (3D) volume of herniated orbital content in patients with an orbital wall fracture.
METHODS
This retrospective study was based on the medical records and radiologic data of 60 patients from January 2014 to June 2016 for a unilateral isolated orbital wall fracture. They were classified into 2 groups depending on whether the fracture involved the inferior wall (group I, n=30) or the medial wall (group M, n=30). The 2D area of the orbital defect was calculated using the conventional formula. The 2D extent of the orbital defect and the 3D volume of herniated orbital content were measured with 3D image processing software. Statistical analysis was performed to evaluate the correlations between the 2D and 3D parameters.
RESULTS
Varying degrees of positive correlation were found between the 2D extent of the orbital defects and the 3D herniated orbital volume in both groups (Pearson correlation coefficient, 0.568−0.788; R²=32.2%−62.1%).
CONCLUSIONS
Both the calculated and measured 2D extent of the orbital defects showed a positive correlation with the 3D herniated orbital volume in orbital wall fractures. However, a relatively large volume of herniation (>0.9 cm³) occurred not infrequently despite the presence of a small orbital defect (<1.9 cm²). Therefore, estimating the 3D volume of the herniated content in addition to the 2D orbital defect would be helpful for determining whether surgery is indicated and ensuring adequate surgical outcomes.

Keyword

Imaging, three-dimensional; Orbital fractures; Orbit

MeSH Terms

Humans
Imaging, Three-Dimensional
Medical Records
Orbit*
Orbital Fractures
Retrospective Studies