Abstract
Purpose
This study aimed to propose a radiological classification of the incudo-stapedial angle by preoperative high-resolution computed tomography (HRCT) images and to highlight its importance for predicting the use of reversal-steps stapedotomy (RSS) rather than the traditional non-reversal technique.
Methods
We included 83 candidates for stapedotomy operation. Two physicians measured the radiological incudo-stapedial joint angle in the preoperative HRCT. According to this measurement, the radiological incudo-stapedial joint was classified into three types: obtuse, right, and acute. In addition, this radiological classification was correlated with the intraoperative use of the stapedotomy technique, either reversal or non-reversal.
Results
The RSS technique was used in forty-two (97.7%) cases with an obtuse angle and twenty-six (89.7%) with a right angle. At the same time, the traditional non-reversal technique was used in all patients with an acute angle. The three groups differed significantly regarding the method used for stapedotomy (P value < 0.001). Moreover, Spearman’s correlation coefficient revealed a significant correlation between the used technique and the radiological type of the incudo-stapedial angle (P value < 0.001).
Conclusions
This prospective study proposed a preoperative radiological classification of the incudo-stapedial angle. This classification was significantly correlated with the type of stapedotomy technique. The RSS technique was feasible in most cases with an obtuse and right radiological incudo-stapedial angle. In contrast, the non-reversal method was used in all patients with an acute radiological incudo-stapedial angle. This radiological classification could predict the choice for the stapedotomy technique with an accuracy of 95.18%, a sensitivity of 73.33%, and a specificity of 100%.
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Data availability
The data presented in this study are available on request from the corresponding author.
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MB designed the work. SE acquired and analyzed data. HAE acquired and analyzed data. MAS acquired and analyzed data. AIE acquired and analyzed data. EC drafted, revised, and approved the manuscript. LV drafted, revised, approved the manuscript. VM drafted, revised, approved the manuscript. HHE agreed to be accountable for all aspects of the work.
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Barbara, M., Elzayat, S., El-Shirbeny, H.A. et al. Assessment of the ability of the radiological incudo-stapedial angle to predict the stapedotomy technique type: a prospective case-series study. Eur Arch Otorhinolaryngol 280, 4879–4884 (2023). https://doi.org/10.1007/s00405-023-08008-7
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DOI: https://doi.org/10.1007/s00405-023-08008-7