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The Scientific World Journal
Volume 2013, Article ID 902945, 6 pages
http://dx.doi.org/10.1155/2013/902945
Clinical Study

Radiological Control of the Floating Mass Transducer Attached to the Round Window

1Department of Otolaryngology at ukb, Hospital of the University of Berlin, Charité Medical School, Warener Street 7, 12683 Berlin, Germany
2Department of Radiology at ukb, Hospital of the University of Berlin, Charité Medical School, 12683 Berlin, Germany

Received 28 July 2013; Accepted 25 September 2013

Academic Editors: T. J. Balkany, M. W. Hsiung, and Y. Noguchi

Copyright © 2013 Ingo Todt et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The surgical rehabilitation of mixed hearing losses can be performed by coupling the floating mass transducer of the Vibrant Soundbridge to the round window. The quality of coupling the floating mass transducer to the round window is crucial for the audiological outcome. It was the aim of this study to further observe the different patterns of floating mass transducer position at the round window. We compared twenty patients with mixed hearing loss implanted with a floating mass transducer attached to the round window and 24 surgeries between 5/2007 and 6/2010. An evaluation of the chronological observation of the flat panel angiography-controlled position of the floating mass transducer at the round window with relation to the surgical report and the audiological outcome was done. We observed no changes in the mean pre- and postbone conduction thresholds. The floating mass transducer position was variable and could be radiologically classified and correlated with the audiologically outcome. A learning curve was observed from the earlier to later implantations. Postoperative, radiological evaluation of the location and angle of the floating mass transducer by means of flat panel tomography allowed us to classify the floating mass transducer position at the round window into 4 groups.