Developmental Changes in Cochlear Orientation-Implications for Cochlear Implantation

Abstract

There is a statistically significant reduction in basal turn angulation relative to the midsagittal plane with increasing age. However, care should be taken in interpreting these results in light of the inherent error in the measuring technique, although the intraobserver repeatability coefficient was only 2.0. The more obtuse angulation of the basal turn in children may have implications for cochlear implantation.

Predicting Round Window Niche Visibility via the Facial Recess Using High-Resolution Computed Tomography

“…Finally, our finding that EAC angle is significantly wider in adults is consistent with the report by McRackan et al (10). Assuming that the EAC maintains the same angle relative to the sagittal plane irrespective of age, the Lloyd et al (17) report also supports our observation. These results suggest that intraoperative RWN visibility improves with age.…”

“…However, Lloyd et al (17) reported that the angle between the basal turn and the midsagittal plane decreases with age, and McRackan et al (10) suggested that the change in the angle between the facial recess and the basal turn is related to age. These parameters can affect FN location and should be studied in a large cohort.…”

Comparison of Cochlear Implant Relevant Anatomy in Children Versus Adults

“…Similarly, the view of the round window through the facial recess is significantly less of a straight line (10.66° greater) in children making electrode implantation more difficult. Post-natal alterations in cochlear orientation have been recently described 9 calling into question prior data regarding cochlear stagnancy. 19 Lloyd’s, et al report of decreasing basal turn angle with regard to the sagital plane with age is consistent with the findings in our study.…”

“…5 However, there is some evidence to show that the basal turn of the cochlea may change orientation with respect to the FR as an individual grows. 9 …”

Avaliação do recesso do nervo facial e cóclea no osso temporal de cadáveres de recém nascidos natimortos com vistas ao implante coclear percutâneo

“…No entanto, existem evidências de que a curva basal da cóclea pode ter sua orientação modificada com relação ao recesso do nervo facial de acordo com o crescimento do indivíduo (Lloyd et al, 2010). Na cirurgia do implante coclear, o segmento mastoideo do nervo facial, o segundo joelho, o nervo corda do tímpano e o anel timpânico estão em maior risco de lesão pois são limites anatômicos para a realização da timpanotomia posterior (Cohen, 1997).…”