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Differences in Hearing After Total Tympanoplasty Due to Presence or Absence of Crura of Stapes

Differences in Hearing After Total Tympanoplasty Due to Presence or Absence of Crura of Stapes Reconstructive surgery for middle ear deafness has to deal with two acoustic principles: (1) construction of a new system of sound-pressure transformation to the oval window and (2) protection of the round window against air-borne sound waves. The transformer function of the intact middle ear is achieved by two mechanisms: (1) hydraulic pressure ratio, based on the difference between the surface areas of tympanic membrane and footplate of the stapes, and (2) lever action of the ossicular chain. Retaining of the hydraulic pressure ratio (e.g., by columella transmission) is one of the main goals of reconstructive surgery of the middle ear. On the other hand, the ossicular lever action is not of any great importance (ratio of 1.3:1, according to Békésy, which increases the hearing by 2.5 db.). Besides, it does not play any role in our considerations, as it is connected with the functioning of an intact ossicular chain http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Otolaryngolog American Medical Association

Differences in Hearing After Total Tympanoplasty Due to Presence or Absence of Crura of Stapes

Archives of Otolaryngolog , Volume 72 (1) – Jul 1, 1960

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Publisher
American Medical Association
Copyright
Copyright © 1960 American Medical Association. All Rights Reserved. Applicable FARS/DFARS Restrictions Apply to Government Use.
ISSN
0003-9977
eISSN
1538-361X
DOI
10.1001/archotol.1960.00740010100017
Publisher site
See Article on Publisher Site

Abstract

Reconstructive surgery for middle ear deafness has to deal with two acoustic principles: (1) construction of a new system of sound-pressure transformation to the oval window and (2) protection of the round window against air-borne sound waves. The transformer function of the intact middle ear is achieved by two mechanisms: (1) hydraulic pressure ratio, based on the difference between the surface areas of tympanic membrane and footplate of the stapes, and (2) lever action of the ossicular chain. Retaining of the hydraulic pressure ratio (e.g., by columella transmission) is one of the main goals of reconstructive surgery of the middle ear. On the other hand, the ossicular lever action is not of any great importance (ratio of 1.3:1, according to Békésy, which increases the hearing by 2.5 db.). Besides, it does not play any role in our considerations, as it is connected with the functioning of an intact ossicular chain

Journal

Archives of OtolaryngologAmerican Medical Association

Published: Jul 1, 1960

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