Conductive Loss

Many patients with a conductive hearing loss can benefit from the Baha® System. The conductive roadblock is completely bypassed as the sound is rerouted directly to the cochlea via bone conduction.

Conductive hearing loss

There are numerous studies detailing the advantages of bone conduction for patients with a conductive hearing loss. The Baha System also requires less amplification compared to conventional hearing aids.1,2 This means that your patients will get better sound quality and less distortion.

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  • Atresia & microtia

    Aural atresia is characterised as the absence of an ear canal, sometimes this is also accompanied by the absence or deformation of the external ear, which is called microtia. Patients with atresia or microtia are often evaluated for reconstructive surgery during childhood. Those who are not suitable candidates for reconstructive surgery are excellent candidates for Baha. Patients who do not achieve satisfactory hearing after surgery can often be helped by Baha

    Benefit of Baha

    In most cases of atresia, Baha provides a solution which is both safe and cost effective when it comes to restoring hearing. In cases where a reconstruction is planned, a Baha sound processor on a Baha Softband is an efficient way to restore their hearing until the reconstruction can be performed.

    Clinical results

    1. Evans AK, Kazahaya K. Canal atresia: "surgery or implantable hearing devices? The expert's question is revisited". Int J Pediatr Otorhinolaryngol 2007 Mar;71(3):367-74.
    2. Magliulo G. Acquired atresia of the external auditory canal: recurrence and long-term results. Ann Otol Rhinol Laryngol 2009 May;118(5):345-9.


  • Cholesteatoma

    A cholesteatoma is a benign growth of skin in an abnormal location such as the middle ear. It usually occurs due to poor eustachian tube function or infection in the middle ear. It often develops as cysts or pouches that shed layers of old skin, which build up inside the middle ear. Over time, the cholesteatoma can increase in size and destroy the surrounding delicate bones of the middle ear. Hearing loss, dizziness, and facial muscle paralysis are rare, but can result from continued cholesteatoma growth.

    Benefit of Baha

    Baha will provide a safe and efficient way of restoring hearing in these patients, with no further risk to their hearing. When the air-bone gap is larger than 30 dB, Baha will outperform conventional hearing aids.

    Clinical results

    1. Wazen JJ, Spitzer J, Ghossaini SN, Kacker A, Zschommler A. Results of the bone-anchored hearing aid in unilateral hearing loss. Laryngoscope 2001 Jun;111(6):955-8.
    2. Ketelslagers K, Somers T, De Foer B, Zarowski A, Offeciers E. Results, hearing rehabilitation, and follow-up with magnetic resonance imaging after tympanomastoid exenteration, obliteration, and external canal overclosure for severe chronic otitis media. Ann Otol Rhinol Laryngol 2007 Sep;116(9):705-11.


  • Chronic otitis media

    Chronic otitis media occurs if a middle ear infection does not resolve, as drainage from the middle ear can become a chronic condition. This disease is much more common in persons with poor Eustachian tube function e.g. patients with cleft lip and palate or Down syndrome.

    Benefit of Baha

    In chronic otitis media the first goal is to achieve an ear free of infection. However, some chronic ears infections are difficult or impossible to treat. For these patients Baha should be recommended, as the ear canal is left undisturbed, reducing the occurrence of further infections.

    Clinical results

    1. Watson GJ, Silva S, Lawless T, Harling JL, Sheehan PZ. Bone anchored hearing aids: a preliminary assessment of the impact on outpatients and cost when rehabilitating hearing in chronic suppurative otitis media. Clin Otolaryngol 2008 Aug;33(4):338-42.
    2. Macnamara M, Phillips D, Proops DW. The bone anchored hearing aid (BAHA) in chronic suppurative otitis media (CSOM). J Laryngol Otol Suppl 1996;21:38-40.


  • External otitis

    External otitis is an inflammation of the outer ear and ear canal. For patients with a hearing loss, external otitis will make fitting of air conduction hearing aids problematic as the ear mould may further irritate the inflammation in the ear canal.

    Benefit of Baha

    In external otitis, Baha is a preferable hearing solution as there is no interference with the ear canal that could aggravate the condition.

    Clinical results

    1. Stenfelt S, Håkansson B, Jonsson R, Granström G. A bone-anchored hearing aid for patients with pure sensorineural hearing impairment: a pilot study. Scandinavian Audiology 2000;29(3):175-85.


  • Otosclerosis

    The most common type of otosclerosis is fixation of the stapes footplate to the oval window of the cochlea. This greatly impairs movement of the stapes and therefore transmission of sound into the inner ear. In all ossicular diseases, the first objective is to restore the function of the ossicular chain by middle ear surgery.

    Benefit of Baha

    Some patients may reject the idea of middle ear surgery, as there is always a risk of further damage to their hearing. There are also patients whose previous surgery has failed to restore the function of the ossicular chain. Baha will provide a safe and efficient way of restoring hearing in these patients, with no further risk to their hearing. When the air-bone gap is larger than 30 dB, Baha will outperform conventional hearing aids.

    Clinical results

    1. Gillett D, Fairley JW, Chandrashaker TS, Bean A, Gonzalez J. Bone-anchored hearing aids: results of the first eight years of a programme in a district general hospital, assessed by the Glasgow benefit inventory. J Laryngol Otol 2006 Jul;120(7):537-42.
    2. McLarnon CM, Davison T, Johnson IJ. Bone-anchored hearing aid: comparison of benefit by patient subgroups. Laryngoscope 2004 May;114(5):942-4.


  • Trauma

    Skull trauma with or without skull fractures may cause hearing loss. If the loss is a conductive loss, or if the trauma results in single-sided deafness, Baha may be a good solution.

    Benefit of Baha

    In conductive losses with an air-bone gap of more than 30 dB, Baha will provide better hearing compared to air conduction hearing aids. In patients with single-sided deafness, Baha will lift the head shadow effect, resulting in better hearing in noise and increased sound awareness.

    Clinical results

    1. Kunst SJ, Hol MK, Snik AF, Bosman AJ, Mylanus EA, Cremers CW. Bone anchored hearing aid in patients with acquired and congenital unilateral inner ear deafness (Baha CROS): clinical evaluation of 56 cases. Ann Otol Rhinol Laryngol 2010 Jul;119(7):447-54.
    2. Dumper J, Hodgetts B, Liu R, Brandner N. Indications for bone-anchored hearing AIDS: a functional outcomes study. J Otolaryngol Head Neck Surg 2009 Feb;38(1):96-105.



  1. Stenfelt S, Håkansson B. Air versus bone conduction: an equal loudness investigation. Hearing Research 2002 May;167(1-2):1-12.
  2. McDermott AL, Dutt SN, Reid AP, Proops DW. An intra-individual comparison of the previous conventional hearing aid with the bone-anchored hearing aid: the Nijmegen group questionnaire. J Laryngol Otol 2002 Jun;116 Suppl 28:15-19.