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Numerical study of Hough technique in surgery of otosclerosis, using the finite element method

Gentil F., Parente M., Martins P., Santos C., Almeida E., Ferreira A., Natali R.

Acta of Bioengineering and Biomechanics

2015

Vol. 17, no. 4

149--153

Purpose: Otosclerosis is a metabolic bone disease of the otic capsule that can cause the stapes fixation, resulting in conductive hearing loss or, in a profound sensorineural deafness threshold. Surgery is one of the possible treatments for the otosclerosis. To repair small focus of otosclerosis in the anterior crus of the stapes, in 1960, Hough suggested the implementation of a technique in which part of the anterior crus is fractured and the stapes turned. As a result, the posterior crus of the stapes is the only connection with the inner ear. In this work, the outcome of Hough’s surgical technique was simulated. Methods: Based on computerized images, a finite element model of middle ear ossicles and tympanic membrane was created, as well as a model where the stapes has changed. The discretization of the tridimensional solid model was made using the ABAQUS software. The mechanical properties used were taken from the literature and adequate boundary conditions were applied. Results: The results obtained with the Hough technique simulation were compared with a representative model of the normal ear, taking into account the displacements obtained on the central part of the stapes footplate and the maximum principal stress in the stapes crus. Conclusions: The results obtained are closer to the normal ear model, therefore Hough technique stands out as a good option to correct small focus of otosclerosis.

Vibrations analysis of ossicles mechanism

Iwaniec M., Marszalik D.

Vibrations in Physical Systems

2010

Vol. 24

29--34

The paper presents kinematic analysis of ossicles mechanism, which is part of the middle ear. Movement , velocity and acceleration trajectories of important points of the mechanism were determined. Influence of the length of the ossicles on the functioning of the mechanism was tested through calculating the relationship of oscillation amplitude of stapes and oscillation amplitude of incus.

Artykuł ten jest poświęcony analizie kinematycznej drgań układu kosteczek słuchowych wchodzących w skład ucha środkowego. Wyznaczono tory ruchu, prędkości oraz przyspieszenia istotnych punktów mechanizmu podczas drgań. Zbadano wpływ zmiany dług ości kosteczek słuchowych na działanie mechanizmu, poprzez wyznaczenie stosunku amplitudy drgań strzemiączka do amplitudy drgań kowadełka.