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PhD defense by Morten Høgsbro

The Department of Clinical Medicine, Aalborg University and Aalborg University Hospital are pleased to invite to PhD defense by M.D., M.Sc., Morten Høgsbro, who will defend the thesis entitled: EARLY LOADING OF BONE ANCHORED HEARING IMPLANTS CLINICAL EVALUATION OF IMPLANT STABILITY AND SOFT TISSUE COMPLICATIONS


14.06.2019 kl. 13.30 - 16.30


The PhD defense will take place

Friday June 14, 2019
Time: 13.30
In the auditorium, Medicinerhuset, Aalborg University Hospital



Associate Prof., PhD, Michael Gaihede
Dept. of Otolaryngology, Head and Neck Surgery
Aalborg University Hospital, Denmark.


Assessment Committee

Prof., DMSc, Jeppe Hagstrup Christensen
Dept. of Clinical Medicine
Aalborg University, Denmark.

Prof., DMSc, Malou Hultcrantz
Division of Ear, Nose and Throat Diseases
Karolinska Institutet, Stockholm, Sweden.

Associate Prof., PhD, Bjarki Djurhuus
Dept. of Otolaryngology, Head and Neck Surgery
Zealand University Hospital, Denmark.


About the PhD thesis

Bone anchored hearing implant surgery is a relatively new discipline within the field of otology. Implanting a titanium screw in the scull bone behind the ear and attaching a vibrating sound processor enables certain patients with a conductive hearing loss to obtain hearing rehabilitation via bone conducted sounds to the inner ear. An important factor for a long lasting successful implantation is the timing of the loading of the hearing processor onto the implant since the presence of the processor and the patient handling thereof might disturb the osseointegration and increase skin inflammation.

This thesis examines whether an early loading time compromises osseointegration and leads to more skin related problems. The thesis also addresses whether different types of implantation surgery lead to different results regarding osseointegration and skin related issues.

The thesis is based on two clinical studies and one laboratory study. The clinical studies comprised of one randomized clinical trial and one prospective cohort study. The laboratory study investigated certain aspects of one of the key measurement techniques used in the clinical studies.

Overall it is found that the implant system under study can be safely loaded with the hearing processor after one or two weeks on adults with normal expected bone quality. However, two weeks are advised to minimize possible soft tissue complications. The goal to obtain an inflammation free area of skin through better integration between implant and soft tissue has not yet been fulfilled and will still pose a challenge to future research and development. This will hopefully encourage scientist to pursue the development in implant design and operating technique.


Department of Clinical Medicine, Aalborg University and Aalborg University Hospital


Medicinerhuset, Mølleparkvej 4, 9000 Aalborg

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