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Obliquity of the stapes in otosclerosis: intra-operative observations and implications in stapes surgery

Published online by Cambridge University Press:  16 November 2015

V Anand  and
H N Udayabhanu
V Anand*
Affiliation:
Department of Otorhinolaryngology and Head and Neck Surgery, MCV Memorial ENT Trust Hospital, Pollachi, Tamil Nadu, India
H N Udayabhanu
Affiliation:
Department of Otorhinolaryngology and Head and Neck Surgery, MCV Memorial ENT Trust Hospital, Pollachi, Tamil Nadu, India
*
Address for correspondence: Dr V Anand, Department of Otorhinolaryngology and Head and Neck Surgery, MCV Memorial ENT Trust Hospital, 115, Palaghat Road, Pollachi (TN) – 642001, India Fax: 0422 223 3591 E-mail: anand@entanand.com
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Abstract

Objective:

To establish the prevalence of stapes obliquity as observed in otosclerosis patients during stapes surgery by a simple method of intra-operative measurement.

Design:

Prospective observational study.

Results:

Intra-operative measurements showed that the mean distance (± standard deviation) between the horizontal segment of the facial nerve and stapes crura in 10 cases of otosclerosis was 0.74 mm (± 0.21 mm), whereas in 10 cases of non-otosclerosis the same distance was 0.20 mm (± 0.00). There was no gap (0 mm) between the stapes crura and inferior border of the oval window niche in otosclerotic ears, whereas in non-otosclerotic ears the same distance was 0.13 mm (± 0.05 mm). The differences were statistically significant (p < 0.0001).

Conclusion:

Obliquity and downward displacement of the stapes occurs in otosclerosis. It has diagnostic value as a new clinical sign in otosclerosis. The findings correlate with late complications and failures in stapes surgery. Methods to avoid these have been suggested.

Keywords

OtosclerosisStapesAnatomy
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 130 , Issue 2 , February 2016 , pp. 134 - 144
Copyright
Copyright © JLO (1984) Limited 2015 

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