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• W2003260810 abstract "In Brief Study Design. Radiographic analysis using normal patients. Objective. To analyze the relationship between the cervical alignment and the oropharyngeal space. Summary of Background Data. Few clinical studies stress the effect of the occipito-C2 (O-C2) alignment on the oropharyngeal space. A previous study showed dysphagia and/or dyspnea after occipitocervical fusion was caused by oropharyngeal stenosis resulting from O-C2 fixation in a flexed position. Other independent researchers showed that development or improvement of obstructive sleep apnea in rheumatoid arthritis patients was related to the O-C2 alignment. However, there are limited basic data demonstrating the relationship between the O-C2 alignment and the oropharyngeal space. Methods. Plain lateral cervical radiographs in five tested positions—neutral, flexion, extension, protrusion, and retraction—of 40 asymptomatic volunteers were collected. The O-C2 angle, the C2–C6 angle, and the anterior–posterior distance of the narrowest oropharyngeal airway space (nPAS) were measured, and the changes in value from the neutral to the other four positions were calculated for each patient. Results. According to the multiple regression analysis, there was an extremely strong linear correlation of the change in the O-C2 angle with the percentage change in the nPAS. Referring to the multiple regression analysis, a decrease of 10° in the O-C2 angle caused a 37% reduction in the nPAS in the neutral position. In contrast, no significant correlation was found between the change in the C2–C6 angle and the percentage change in the nPAS. Conclusion. Our results show the impact of the O-C2 angle on the oropharyngeal space. This knowledge will be useful for the diagnosis and treatment of the upper cervical lesion combined with the upper airway stenosis, and for the determination of the optimal fixation angle in occipitocervical fusion. Five lateral cervical radiographs taken in neutral, flexion, extension, protrusion, and retraction positions of 40 healthy volunteers were investigated as for cervical alignment and oropharyngeal space. The narrowest oropharyngeal space was strongly correlated with the occipito-C2 alignment, but not with the C2–C6 alignment." @default.
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• W2003260810 date "2011-05-01" @default.
• W2003260810 modified "2023-10-16" @default.
• W2003260810 title "Impact of the O-C2 Angle on the Oropharyngeal Space in Normal Patients" @default.
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• W2003260810 doi "https://doi.org/10.1097/brs.0b013e3181f9f714" @default.
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