Rotatory Chair Testing in Otology: Biomechanical Modeling and Numerical Simulation
Résumé
Rotational chair testing is one of the clinical gold standards for assessing vestibular function in case of dizziness and vertigo. To ensure the body balance control within space, the vestibule of the inner ear senses head acceleration. The vestibule detects the deflection of some ciliated cells during head movements. Deflection and strain of cilia are induced by the interactions between inner ear fluids endolymph and perilymph and thin structures that are the membranous labyrinth of the vestibule and the cupula. The present work aimed to study these interactions by developing a finite element (FE) model of a part of the human vestibule called the lateral semicircular canal. While several models in the literature use an approach with a rigid canal, the present work explores the results of rotational testing with the influence of the membranous labyrinth modeled as flexible and the cupula following a viscoelastic behaviour. When compared to literature, results show similar transversal deformation trends of the cupula. Values of the maximal displacement of the cupula differ depending on simulations and mainly because of different assumptions that are mentioned.
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