Publication date: Available online 3 September 2018
Source: Journal of Oral and Maxillofacial Surgery
Author(s): Ali Ebrahimi, Mohammad Hosein Kalantar Motamedi, Hamid Reza Rasouli, Navid Naghdi
Abstract
Purpose
The orbital cavity may be affected in zygomatico-maxillary complex (ZMC) fractures. The aim of this study was to assess the relationship between orbital volume changes and enophthalmos in patients with ZMC fractures.
Methods
A descriptive study was done in consecutive adult patients suffering recent isolated unilateral ZMC fractures who were otherwise healthy during 2016-2017. Multi-slice CT-scans were taken from all patients and enophthalmos was measured clinically using a Hertel exophthalmometer. In the axial plane enophthalmos was measured on the CT-scan using Mimics software. Three-dimensional reconstruction and volume measurement of the orbital cavity were also done via Mimics software. The correlation between the clinical and radiographic amounts of enophthalmos was measured by Pearson's correlation coefficient analysis. The association between radiographic enophthalmos, clinical enophthalmos and volume changes of the orbital cavity was also assessed by linear regression. P value was set at 0.01.
Results
Ninety six patients (77 males, 19 females) with a mean age of 28.48 ± 8.29 were assessed. Mean volume of controls and fractured bony orbits measured on CT were 29.02 ± 1.71 and 32.05 ± 2.22 cm3, respectively (P < 0.001). There was a high positive correlation between the amounts of enophthalmos measured clinically and radiographically (correlation coefficient= 0.97, P < 0.001). Based on linear regression model, for each 1 cm3 of orbital volume change, clinical and radiographic enophthalmos change by 0.68 and 0.71 mm, respectively (P < 0.0001)
Conclusion
ZMC fractures commonly increase orbital volume and degree of it is highly correlates with enophthalmos.
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