MORPHOMETRIC STUDY OF THE BONY ORBIT
Journal Title: Journal of Evolution of Medical and Dental Sciences - Year 2018, Vol 7, Issue 26
Abstract
BACKGROUND Ocular surgeries and craniofacial surgeries require retrobulbar nerve blocks to produce anaesthesia and akinesia of the eyeball, which involves a risk to the optic nerve. The aim of this study is to determine the distance of the optic canal from various bony landmarks on the orbital margin of both sides of the skull and correlate these values with the orbital index. MATERIALS AND METHODS For the study, 62 human dry skulls of unknown sex were obtained from the bone bank of Anatomy Department, AIMS, Kochi. Using a digital Vernier calliper, the following parameters were measured: orbital height, orbital width, distance of the optic canal from certain landmarks on the orbital margins (Superior, Inferior, Medial and Lateral). The orbital index was calculated. Statistical Analysis- The observations were analysed using paired t-test (p < 0.05 was considered to be significant). The statistical software used was IBM SPSS version 20.0. Settings and Design- Anatomy Department, AIMS, Kochi. This is a descriptive study. RESULTS The mean distance between the optic canal and the landmarks on the superior, inferior and medial margins is significantly different on right and left sides (significance, p= 0.001). Whereas, the mean distance of the optic canal from a point on the zygomaticofrontal suture (lateral margin) did not show any significant difference on both sides. The mean values of the orbital index on the left and right sides were 79.48 and 80.40 respectively and not significantly different (p= 0.517). 67.7% of the total skulls observed belonged to microseme category (orbital index ≤ 83). The safe distance to the optic nerve from the orbital margins were obtained by reducing 5 mm from the shortest distance on each side. CONCLUSION The knowledge of these values is vital in the evaluation, diagnosis, pre-operative and per-operative planning of management for craniofacial syndromes, post-traumatic facial deformities and in the treatment of orbital abnormalities to produce the best aesthetic and functional result. It is also of relevance to anaesthetists in ocular surgeries, while various nerve blocks are being employed.
Authors and Affiliations
Sruthi S, Biju Urumese Palatty, Geetha S. G
Keywords
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- EP ID EP466512
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