Surgical Landmark of Optic Foramen: Evaluation by 3D-CT
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Date
2010-03-11
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Thammasat University, Rangsit Campus
Abstract
Objective: The aim of this study was to determine the distance and direction of the optic foramen and inferior orbital rim at the reference point above infraorbital foramen. Materials and methods: Among the patients who had undergone CT scan by CT I-CAT, we evaluated the results of 150 orbits (75 male and 75 female). We measured distances and angles of optic foramen from inferior orbital rim by Simplant Master version 11 and Simplant CMF Module. Using the mean, standard deviation and 95% CI, all were analyzed by SPSS 11.5 for Window. Statistical differences were calculated between males and females using unpaired t-test. Results: The distances from optic foramen to inferior orbital rim above infraorbital foramen in males and females were 49.15+/-3.09 and 46.74+/-2.87 mm respectively (p=.000) and 95% CI were 48.44›49.87 and 46.08-47.40 mm respectively. The angle between the imaginary line drawing from optic foramen to that point on the inferior orbital rim and the saggital plane in males and females were 18.55+/-3.40 and 20.23+/-3.80 degree respectively (p=.005) and 95% CI were 17.76-19.33 and 17.37-18.97 degree respectively. Conclusion: In males, the optic foramen were located at 49.15+/-3.09 mm away from inferior orbital rim above infraorbital foramen and their directions were 18.55+/-3.40 degree medially to saggital plane. In females, the optic foramens were located at 46.74+/-2.87 mm away from inferior orbital rim above infraorbital foramen and their directions were 20.23+/-3.80 degree medially to saggital plane. From statistical data, l andmark of optic foramen were significantly difference in males and females.
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Thammasat Medical Journal - ธรรมศาสตร์เวชสาร; Vol.9 No.3 July-September 2009; 251-258