Intraoperative Assessment of Stapes Movement

Huber, Alexander; Linder, Thomas; Ferrazzini, Mattia; Schmid, Stephan; Dillier, Norbert; Stoeckli, Sandro J.; Fisch, Ugo

doi:10.1177/000348940111000106

Cited by 87 publications

(72 citation statements)

References 6 publications

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“…TBs were obtained in intraoperative measurements (Huber et al 2001, Chien et al 2009), 449 which strongly argues against large post-mortem effects. Therefore, our observation that the 450 immobilized IMJ generates larger piston-like motions than the mobile IMJ only at frequencies 451 above 2 kHz is not likely to be from the post-mortem changes of the TBs.…”

Section: Quantification Of the Imj Mobility 211mentioning

confidence: 96%

Contribution of the incudo-malleolar joint to middle-ear sound transmission

et al. 2015

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The malleus and incus in the human middle ear are linked by the incudo-malleolar joint (IMJ). The mobility of the human IMJ under physiologically relevant acoustic stimulation and its functional role in middle-ear sound transmission are still debated. In this study, spatial stapes motions were measured during acoustic stimulation (0.25-8 kHz) in six fresh human temporal bones for two conditions of the IMJ: (1) normal IMJ and (2) IMJ with experimentally-reduced mobility. Stapes velocity was measured at multiple points on the footplate using a scanning laser Doppler vibrometry (SLDV) system, and the 3D motion components were calculated under both conditions of the IMJ. The artificial reduction of the IMJ mobility was confirmed by measuring the relative motion between the malleus and the incus. The magnitudes of the piston-like motion of the stapes increased with the reduced IMJ mobility above 2 kHz. The increase was frequency dependent and was prominent from 2 to 4 kHz and at 5.5 kHz. The magnitude ratios of the rocking-like motions to the piston-like motion were similar for both IMJ conditions. The frequency-dependent change of the piston-like motion after the reduction of the IMJ mobility suggests that the IMJ is mobile under physiologically relevant levels of acoustic stimulation, especially at frequencies above 2 kHz. The malleus and incus in the human middle ear are linked by the incudo-malleolar joint 10 (IMJ). The mobility of the human IMJ under physiologically relevant acoustic stimulation and 11 its functional role in middle-ear sound transmission are still debated. In this study, spatial 12 stapes motions were measured during acoustic stimulation (0.25-8 kHz) in six fresh human 13 temporal bones for two conditions of the IMJ: (1) normal IMJ and (2) IMJ with 14 experimentally-reduced mobility. Stapes velocity was measured at multiple points on the 15 footplate using a scanning laser Doppler vibrometry (SLDV) system, and the 3D motion 16 components were calculated under both conditions of the IMJ. The artificial reduction of the 17 IMJ mobility was confirmed by measuring the relative motion between the malleus and the 18 incus. The magnitudes of the piston-like motion of the stapes increased with the reduced IMJ 19 mobility above 2 kHz. The increase was frequency dependent and was prominent from 2-4 20 kHz and at 5.5 kHz. The magnitude ratios of the rocking-like motions to the piston-like 21 motion were similar for both IMJ conditions. The frequency-dependent change of the piston-22 like motion after the reduction of the IMJ mobility suggests that the IMJ is mobile under 23 physiologically relevant levels of acoustic stimulation, especially at frequencies above 2 kHz. 24 2

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Section: Quantification Of the Imj Mobility 211mentioning

confidence: 96%

Contribution of the incudo-malleolar joint to middle-ear sound transmission

et al. 2015

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“…It has been reported that the human stapes motions are piston-like at low frequencies and include rocking motions along the long and short axes of the footplate at high frequencies (Heiland et al 1999;Huber et al 2001;Hato et al 2003). Studies of rocking motions have been extended to other animals such as cat (Decraemer et al 2000) and gerbil (Decraemer et al 2007;Ravicz et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Complex Stapes Motions in Human Ears

Sim

Chatzimichalis

Lauxmann

et al. 2010

JARO

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It has been reported that the physiological motion of the stapes in human and several animals in response to acoustic stimulation is mainly piston-like at low frequencies. At higher frequencies, the pattern includes rocking motions around the long and short axes of the footplate in human and animal ears. Measurements of such extended stapes motions are highly sensitive to the exact angulation of the stapes in relation to the measurement devices and to measurement errors. In this study, velocity in a specific direction was measured at multiple points on the footplates of human temporal bones using a Scanning Laser Doppler Vibrometer (SLDV) system, and the elementary components of the stapes motions, which were the piston-like motion and the rocking motions about the short and long axes of the footplate, were calculated from the measurements. The angular position of a laser beam with respect to the stapes and coordinates of the measurement points on the footplate plane were calculated by correlation between the SLDV measurement frame and the footplate-fixed frame, which was obtained from micro-CT images. The ratios of the rocking motions relative to the piston-like motion increased with frequency and reached a maximum around 7 kHz.A novel method for quantitatively assessing measurements of complex stapes motions and error boundaries of the motion components is presented. In the frequency range of 0.5 to 8 kHz, the magnitudes of the piston-like and two rocking motions were larger than estimated values of the corresponding upper error bounds.

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“…Our results show that the dominant mechanisms relate to the pathoanatomy of the patient. Measurements of the stapes motility U s /p s indicate that the stapes oscillates at the largest velocity amplitudes for sound stimuli between approximately 800 Hz and 2 kHz (Kringlebotn and Gundersen 1985;Huber et al 2001;Chien et al 2009). According to predictions for the fluid fraction ϕ by Kim et al (2013), a larger percentage of the stapes-induced flow enters the vestibular ducts at lower frequencies, whereas higher sound frequencies favor a stimulation of the cochlear ducts.…”

Section: Steady Streaming Mechanismsmentioning

confidence: 99%

“…Here, ϕ is defined as the percentage of the stapes-induced flow which enters the cochlear scalae (the rest enters the vestibular system). This is incorporated into a lumped lever arm model (Grieser 2015, p. 29) with which we can compute the vestibular perilymph velocity amplitudes U p [m/s] as a function of the frequency f and the sound pressure level SPL measured in the ear canal, (Kringlebotn and Gundersen 1985) as well as in vivo (Huber et al 2001;Chien et al 2009) in human ears for harmonic sound stimuli.…”

Section: Physical Modelmentioning

confidence: 99%

Identifying Mechanisms Behind the Tullio Phenomenon: a Computational Study Based on First Principles

Grieser

Kleiser

Obrist

2016

JARO

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Patients with superior canal dehiscence (SCD) suffer from events of dizziness and vertigo in response to sound, also known as Tullio phenomenon (TP). The present work seeks to explain the fluid-dynamical mechanisms behind TP. In accordance with the socalled third window theory, we developed a computational model for the vestibular signal pathway between stapes and SCD. It is based on first principles and accounts for fluid-structure interactions arising between endolymph, perilymph, and membranous labyrinth. The simulation results reveal a wave propagation phenomenon in the membranous canal, leading to two flow phenomena within the endolymph which are in close interaction. First, the periodic deformation of the membranous labyrinth causes oscillating endolymph flow which forces the cupula to oscillate in phase with the sound stimulus. Second, these primary oscillations of the endolymph induce a steady flow component by a phenomenon known as steady streaming. We find that this steady flow of the endolymph is typically in ampullofugal direction. This flow leads to a quasi-steady deflection of the cupula which increases until the driving forces of the steady streaming are balanced by the elastic reaction forces of the cupula, such that the cupula attains a constant deflection amplitude which lasts as long as the sound stimulus. Both response types have been observed in the literature. In a sensitivity study, we obtain an analytical fit which very well matches our simulation results in a relevant parameter range. Finally, we correlate the corresponding eye response (vestibuloocular reflex) with the fluid dynamics by a simplified model of lumped system constants. The results reveal a "sweet spot" for TP within the audible sound spectrum. We find that the underlying mechanisms which lead to TP originate primarily from Reynolds stresses in the fluid, which are weaker at lower sound frequencies.

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Intraoperative Assessment of Stapes Movement

Cited by 87 publications

References 6 publications

Contribution of the incudo-malleolar joint to middle-ear sound transmission

Contribution of the incudo-malleolar joint to middle-ear sound transmission

Complex Stapes Motions in Human Ears

Identifying Mechanisms Behind the Tullio Phenomenon: a Computational Study Based on First Principles

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