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KMID : 0361020090520090730
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Korean Journal of Otolaryngology - Head and Neck Surgery
2009 Volume.52 No. 9 p.730 ~ p.735
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A Spatial Index Analysis for Decision on the First Opening of Facial Recess in Posterior Tympanotomy
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Kang Jae-Ho
Choi Kyung-Min
Han Jang-Hee
Kim Choon-Dong
Kim Seung-Woo
Park Sung-Ho
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Abstract
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Background and Objectives; Temporal bone is a complicated structure anatomically. Highresolution computed tomography (HRCT) provides a good method for examination of the middle ear, inner ear anatomy and pathologic changes in the temporal bones. The purpose of this study is to evaluate the relations of facial nerve and other structures in temporal bone and factors influencing access to posterior tympanotomy according to the age, sex and degree of temporal bone pneumatizaton.
Subjects and Method: A total of 133 ears of temporal bone computer tomograph (TBCT) were analyzed. We measured the distances and angle between important surgical landmarks, and compared the data according to the age, sex and mastoid pneumatization.
Results: We presented the angle between the posterior wall of external auditory canal and the facial nerve with the index for facial nerve preservation in posterior tympanotomy. This angle is 10.05°other indices are not related statistically.
Conclusion: This results may enable preoperative assessment and provide background knowledge to prevent facial nerve injury when performing a posterior tympanotomy.
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KEYWORD
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Facial recess, External auditory canal, Posterior tympanotomy, Temporal bone
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