Implanting straight into cochlea risks the facial nerve: a Cartesian coordinate study

Deshpande, Anita; Todd, N. Wendell

doi:10.1007/s00276-016-1670-5

Cited by 6 publications

(1 citation statement)

References 19 publications

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“…Though these authors obtained consistent measurements, the study was limited by a small sample of temporal bones (TB). 13 The authors of this study hope these measurements will be useful in evaluating potential candidates for CI and TDD by highlighting RW anatomic variation and approximating RWM position and orientation to identify unfavorable anatomy.…”

Section: Introductionmentioning

confidence: 99%

Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery

Nguy

Saidha

Jay

et al. 2021

World j. otorhinolaryngol.-head neck surg.

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Objective To determine anatomic relationships and variation of the round window membrane to bony surgical landmarks on computed tomography. Study design Retrospective imaging review. Methods 100 temporal bone images were evaluated. Direct measurements were obtained for membrane position. Vector distances and angulation from umbo and bony annulus were calculated from image viewer software coordinates. Results The angle of round window membrane at junction with cochlear basal turn was (42.1 ± 8.6)°. The membrane's position relative to plane of the facial nerve through facial recess was (14.7 ± 5.2)° posterior from a reference line drawn through facial recess to carotid canal. Regarding transtympanic drug delivery, the round window membrane was directed 4.1 mm superiorly from the inferior annulus and 5.4 mm anteriorly from the posterior annulus. The round window membrane on average was angled superiorly from the inferior annulus (77.1 ± 27.9)° and slightly anteriorly from the posterior annulus (19.1 ± 11.1°). The mean distance of round window membrane from umbo was 4 mm and posteriorly rotated 30° clockwise from a perpendicular drawn from umbo to inferior annulus towards posterior annulus. Together, these measurements approximate the round window membrane in the tympanic membrane's posteroinferior quadrant. Conclusions These radiologic measurements demonstrate normal variations seen in round window anatomy relative to facial recess approach and bony tympanic annulus, providing a baseline to assess round window insertion for cochlear implantation and outlines anatomic factors affecting transtympanic drug delivery.

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Section: Introductionmentioning

confidence: 99%