Abstract
Purpose
Homogeneous development of temporal bone structures is explained by their ontogenic origin; tegmen tympani (TT) and superior semicircular canal (SSC) are related with the glenoid fossa at the temporomandibular joint (TMJ). Therefore, our objective was to determine a possible relationship between TT status (dehiscence or integrity) and the roof of the glenoid fossa (RGF) thickness; SSC status has also been considered.
Methods
This cross-sectional descriptive study was conducted in two tertiary hospitals on 95 patients (109 ears) presenting hypoacusia, facial palsy, vertigo, tinnitus, and other single or combined symptoms, and submitted to a thin-section multidetector-row computed axial tomography (CT) scan.
Results
A significant interaction effect of TT × SSC statuses on RGF thickness was found (p = 0.049). A significant difference in RGF thickness was found only for SSC integrity status between TT integrity and TT dehiscence (p = 0.004). The TT dehiscence increased the risk for RGF dehiscence 12.047 times (p = 0.002).
Conclusions
There is an interaction effect of the statuses of both TT and SSC on the thickness of the RGF, instead of an independent effect of the TT status. When RGF dehiscence is found, TT and SSC statuses should be assessed, to discard associated dehiscences.
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Protocol/project development: JW, AIC, MAC. Data collection and management: JW, JJF, MAC, RC, AW, LVM. Data analysis: JW, MTT. Manuscript writing/edition: JW, AIC, JJF, AW,RC, LVM, MAC, MTT.
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Whyte, J., Cisneros, A.I., Fraile, J.J. et al. Interaction effect of tegmen tympani and superior semicircular canal statuses on the thickness of the roof of the glenoid fossa: a cross-sectional descriptive study. Surg Radiol Anat 42, 75–80 (2020). https://doi.org/10.1007/s00276-019-02358-w
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DOI: https://doi.org/10.1007/s00276-019-02358-w