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Histopathological differences in bony destruction of malleus and incus following mastoidectomy

Published online by Cambridge University Press:  11 June 2010

T Sasaki ,
A Xu ,
K Ito ,
S-I Ishimoto ,
T Yamasoba ,
K Kaga  and
N Yamauchi
T Sasaki*
Affiliation:
Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Japan
A Xu
Affiliation:
Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Japan Department of Otorhinolaryngology, Qilu Hospital, Faculty of Medicine, University of Shandong, Jinan, Shandong, China
K Ito
Affiliation:
Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Japan
S-I Ishimoto
Affiliation:
Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Japan
T Yamasoba
Affiliation:
Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Japan
K Kaga
Affiliation:
Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Japan
N Yamauchi
Affiliation:
Department of Pathology, Faculty of Medicine, University of Tokyo, Japan
*
Address for correspondence: Dr Toru Sasaki, Department of Otolaryngology, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan. Fax: +81 3 3814 9486 E-mail: torusasaki-tky@umin.ac.jp
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Abstract

Objectives:

Upon direct inspection of surgically removed ossicles from the ears of patients with long-term post-mastoidectomy cavity problems, the extent of malleus destruction often appears greater in patients with a longer duration of cavity problems, whereas the extent of incus destruction does not appear to correlate with the duration of cavity problems. This study aimed to investigate this impression.

Materials and methods:

As a result of total middle-ear reconstruction, 41 ossicles (21 malleus and 20 incus bones) were obtained from 31 patients with post-mastoidectomy cavity problems. The ossicles were examined histopathologically, and the proportion of lamellar bone area to total bone area (expressed as percentage lamellar bone) was measured. We also calculated the inter-operation time, i.e. the time period between the previous mastoidectomy and the recent total middle-ear reconstruction; this parameter was used as an approximate measure of the duration of the patient's cavity problem. Correlations between percentage lamellar bone and inter-operation time were calculated for the two ossicles.

Results:

The range of inter-operation times was seven to 65 years. We observed a correlation between percentage lamellar bone and inter-operation time for malleus bones (r = −0.512, p < 0.05), but not for incus bones.

Conclusion:

These results were in agreement with our pre-study impressions.

Keywords

MastoidChronic Otitis MediaIncusMalleusOtological Surgical Procedures
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 124 , Issue 11 , November 2010 , pp. 1162 - 1166
Copyright
Copyright © JLO (1984) Limited 2010

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