Bone-Anchored Hearing Aid (BAHA)

Introduction

A bone-anchored hearing aid, usually called a BAHA, is a small implantable device that helps people hear by sending sound through the bone of the skull, directly to the inner ear. It is offered when a regular hearing aid worn in or behind the ear is not the best fit — for example, when the outer or middle ear cannot carry sound normally, or when one ear has no useful hearing at all.

If your ENT surgeon or audiologist has suggested a BAHA, you are probably weighing what the surgery involves, how the device feels day to day, and how it compares with other options. This article walks through what a BAHA is, who it tends to help, the different types of bone conduction systems, how the operation is performed, what recovery looks like, and what to expect in the months and years after the device is fitted. It also covers paediatric considerations, because BAHA systems are commonly used in children with congenital ear conditions.

The decisions about whether a BAHA is right, which system to use, and when to have surgery are clinical ones, made together with your ENT surgeon and audiologist. This article gives you the background to take part in those conversations.

What Is a Bone-Anchored Hearing Aid?

A bone-anchored hearing aid is a hearing system that uses bone conduction — the natural ability of the skull bones to carry sound vibrations to the inner ear (the cochlea). Instead of pushing sound waves down the ear canal, a BAHA picks up sound through a small external processor, converts it into vibrations, and passes those vibrations through a fixture anchored in the bone behind the ear. The cochlea receives the vibrations and turns them into nerve signals, just as it would for any other sound.

A complete BAHA system has three main parts:

• A titanium implant (fixture), surgically placed into the skull bone behind the ear. Titanium is used because bone tissue grows tightly around it — a process called osseointegration.
• A connector, which either passes through the skin (an abutment) or sits under the skin with a magnet (a transcutaneous coupling).
• A sound processor, a small external device clipped or magnetically attached to the connector. The processor contains the microphone, batteries, and electronics.

The device is sometimes also called a bone conduction implant, a bone conduction hearing system, or referred to by brand names such as Baha, Ponto, or Bonebridge — these are different manufacturers' versions of the same general technology.

Why Is a BAHA Performed?

A BAHA is considered when sound cannot reach the inner ear through the normal pathway, but the inner ear itself (the cochlea and hearing nerve) still works reasonably well. By sending sound directly through bone, the device bypasses problems in the ear canal and middle ear. The main reasons doctors recommend a BAHA are:

Conductive hearing loss

This is hearing loss caused by a blockage or problem in the outer or middle ear that stops sound from being conducted to the cochlea. Common causes include:

• Chronic middle ear disease, such as long-standing ear infections, chronic perforations of the eardrum, or cholesteatoma (an abnormal skin growth in the middle ear).
• Otosclerosis, where one of the small middle-ear bones becomes stiff.
• Atresia or microtia, where a child is born with a narrowed or absent ear canal, sometimes with a small or unformed outer ear.
• Draining ears or chronically inflamed ear canals, where a conventional ear-mould hearing aid cannot be worn comfortably or hygienically.

Mixed hearing loss

Mixed hearing loss combines a conductive component (outer or middle ear) with a sensorineural component (inner ear or nerve). A BAHA can address the conductive part by bypassing it, while the sound processor itself amplifies enough to compensate for some sensorineural loss, depending on the degree.

Single-sided deafness (SSD)

In single-sided deafness, one ear has normal or near-normal hearing and the other has profound hearing loss that cannot be helped with a conventional hearing aid. A BAHA placed on the deaf side picks up sound and transmits it through the skull to the cochlea of the hearing ear. The brain then receives sound from both sides of the head, which can make it easier to follow conversations in noisy environments and reduce the “head shadow” effect, where speech on the deaf side is missed.

When conventional hearing aids cannot be used

Some patients have ear anatomy or skin conditions that make a conventional in-the-ear or behind-the-ear hearing aid impractical — for example, persistent ear canal infections, severe eczema of the ear canal, or surgical changes after previous ear operations. A BAHA does not block the ear canal and so avoids these issues.

Who Is a Candidate?

Candidacy for a BAHA is decided by an ENT surgeon and an audiologist together, based on hearing tests, imaging of the ear and temporal bone, and an assessment of the patient's overall health. In general, a person may be considered a candidate if:

• They have conductive or mixed hearing loss within the range the device is designed to help, or they have single-sided deafness.
• The cochlea and hearing nerve on at least one side function well enough to make use of the transmitted sound.
• Conventional hearing aids have been tried or considered and found unsuitable.
• There is enough healthy skull bone behind the ear to anchor an implant. In very young children, the bone may not yet be thick enough — in which case a non-surgical softband is used until the child is older.
• They are healthy enough to undergo a minor surgical procedure under local or general anaesthesia.

Before surgery is offered, most centres ask patients to trial the sound through a test band or softband — a headband-style device that holds a sound processor against the skin behind the ear without any implant. This lets the patient and the audiologist judge whether bone conduction sound is genuinely helpful before committing to surgery.

Alternatives to a BAHA

A BAHA is one option among several for the types of hearing loss it addresses. The alternatives depend on the underlying problem and on the patient's preferences.

Conventional hearing aids

For many people with mild to moderate hearing loss, including some conductive losses, a behind-the-ear or in-the-ear hearing aid is the first-line option. These are non-surgical, can be trialled and changed easily, and have improved considerably in recent years. They are not suitable when the ear canal cannot tolerate a mould, when there is chronic drainage, or when the loss is too severe on one side for the aid to help.

CROS and BiCROS hearing aids

For single-sided deafness, a CROS (contralateral routing of signal) hearing aid uses a microphone on the deaf ear that wirelessly sends sound to a receiver on the hearing ear. A BiCROS system does the same when the better ear also has some hearing loss that needs amplification. These avoid surgery but require two devices to be worn.

Middle ear surgery

If the conductive hearing loss is caused by a treatable problem — for example, otosclerosis (stapedotomy or stapedectomy), tympanic membrane perforation (tympanoplasty), or ossicular chain damage (ossiculoplasty) — reconstructive ear surgery may restore hearing without an implant. ENT surgeons typically discuss these first when the underlying condition is suitable.

Active middle ear implants

Some patients are candidates for an active middle ear implant, a different type of implantable device that vibrates one of the middle ear bones or the round window membrane directly. These are used in selected cases of mixed or sensorineural hearing loss.

Cochlear implants

When hearing loss is severe to profound and sensorineural (a cochlea or nerve problem), a cochlear implant may be considered. Cochlear implants are not a substitute for a BAHA in conductive hearing loss, and a BAHA is not a substitute for a cochlear implant in profound sensorineural loss — they address different problems. In single-sided deafness with a deaf ear that still has a functioning nerve, a cochlear implant in the deaf ear is another option some centres offer.

Doing nothing

Choosing not to treat the hearing loss, or continuing with strategies such as preferential seating, lip-reading, and accommodations at school or work, is a valid option for some adults. Untreated hearing loss does have downstream effects on communication, social participation, and in older adults on cognition, so the decision to leave it untreated is one to discuss carefully with the clinical team.

Types of Bone-Anchored Hearing Systems

Percutaneous (skin-penetrating) systems

This is the original BAHA design. The titanium implant is placed in the skull bone, and a small metal post called an abutment passes through the skin. The external sound processor snaps onto the abutment. Because the connection is a direct mechanical one, percutaneous systems transmit sound very efficiently, which can be an advantage for greater degrees of hearing loss.

The trade-off is that the skin around the abutment needs daily cleaning and can sometimes become inflamed or infected. Modern abutment designs and surgical techniques have reduced these issues considerably compared with earlier generations.

Transcutaneous (through-the-skin) systems

In transcutaneous systems, nothing passes through the skin. The implant has a magnet (or sits under a magnetic plate), and the external processor holds in place magnetically over intact skin. Examples include passive systems where all the electronics are external, and active systems (such as the Bonebridge) where part of the device that creates the vibration is implanted under the skin.

The advantage is cosmetic and hygienic — there is no skin-penetrating post to care for. The trade-off is that some sound energy is absorbed by the skin between the processor and the implant, so transcutaneous systems may be better suited to milder degrees of conductive or mixed loss. Active transcutaneous systems address some of this energy loss by placing the vibrating element under the skin.

Softband (non-surgical) devices

A softband is a fabric or elastic headband that holds a sound processor against the skin behind the ear, without any surgery or implant. Softbands are commonly used in:

• Young children, particularly infants and toddlers with congenital conductive hearing loss, whose skulls are not yet thick enough for safe implantation. Most surgeons wait until around three to five years of age (with some variation) before considering implantation, while the child wears a softband in the meantime.
• Adult patients trialling the technology, before committing to surgery.
• Patients who prefer not to have surgery, for medical or personal reasons.

Sound quality through a softband is usually a step below an implanted system, because of the soft tissue between processor and skull, but it is enough to provide useful hearing and language exposure during the years before surgery.

Surgical Approaches

Implantation surgery for a BAHA is generally a short, well-tolerated procedure. The exact technique depends on the type of system being placed and the surgeon's training.

Minimally invasive (linear or punch) technique

For percutaneous systems, most modern surgery uses a small skin incision or a circular punch behind the ear, without removing soft tissue around the abutment. The implant is drilled into the bone, the abutment is attached, and the skin closes around it. This technique typically has faster healing and lower rates of skin problems than older approaches that removed a wide area of skin tissue.

Tissue-reduction technique

An older approach involved thinning the skin and removing some fat around where the abutment would emerge, to reduce skin movement against the post. Many surgeons have moved away from this in favour of tissue-preserving methods, though it is still used in some cases.

Transcutaneous implantation

For magnetic transcutaneous systems, the surgeon makes a small incision behind the ear, creates a bed in the bone for the implant or magnet, secures the implant, and closes the skin over it. There is no abutment to manage post-operatively. For active transcutaneous systems such as the Bonebridge, a slightly larger area of bone is prepared to accommodate the vibrating element.

Anaesthesia

Many adult patients can have a BAHA implant under local anaesthesia with the area numbed and sometimes with mild sedation. Children and some adults have the procedure under general anaesthesia. The choice depends on patient preference, age, anxiety, and the surgical centre's usual practice.

Preparing for BAHA Surgery

Before the procedure, the team will usually arrange:

• A full audiological assessment, including pure tone audiometry, bone conduction testing, and speech understanding tests. This confirms that the type and degree of hearing loss are appropriate for a BAHA.
• A trial with a softband or test rod, so you can experience the sound before committing to surgery.
• Imaging, most commonly a CT scan of the temporal bone in selected cases — especially in children, in revision surgery, or where the anatomy is unusual.
• Discussion of device options, including percutaneous versus transcutaneous, and which sound processor models would suit your hearing profile and lifestyle.
• A general health check, particularly important for older adults or those with diabetes, skin conditions, or conditions that affect wound healing.

You will usually be asked to:

• Wash your hair and the area behind the ear the night before or morning of surgery.
• Avoid eating and drinking for a set number of hours before surgery if general anaesthesia is planned.
• Tell your surgeon about all medications, including blood thinners, herbal supplements, and any history of bleeding problems.
• Arrange for someone to take you home afterwards if you are having sedation or general anaesthesia.

What Happens During the Procedure

BAHA surgery is usually a short outpatient procedure, often taking between 30 minutes and an hour, depending on the system used.

The general sequence is:

1. Positioning and preparation. You lie on your side or back with the surgical side facing up. A small patch of hair behind the ear is shaved, and the area is cleaned and draped.
2. Anaesthesia. Local anaesthetic is injected, or general anaesthesia is given.
3. Marking the site. The surgeon identifies the exact location behind the ear where the implant will sit — far enough from the ear to allow the sound processor to clip on without touching the auricle, and where the bone is thick enough.
4. Bone preparation. A small incision or punch is made. A specialised drill creates a hole and then widens it to fit the titanium implant. Drilling is done with cooling irrigation to protect the bone.
5. Implant placement. The titanium fixture is gently screwed into the prepared bone. For percutaneous systems, the abutment is attached. For transcutaneous systems, the magnet or vibrating element is positioned and secured.
6. Closure. The skin is closed with sutures, and a small protective dressing is applied. For percutaneous systems, a healing cap may be placed over the abutment for the first few days.

First days

Discomfort is usually mild and managed with simple pain medication. The dressing is typically removed a few days after surgery. Some swelling, bruising, or numbness around the implant site is normal and settles over weeks.

First weeks

Stitches are either dissolvable or removed at a follow-up visit, usually within one to two weeks. You will be shown how to clean the area gently. For percutaneous abutments, this includes careful cleaning around the post once the initial healing is well underway.

Most people return to normal daily activities within a week or two, avoiding heavy lifting, contact sports, and swimming until the wound has fully healed.

Activation and fitting

The sound processor is not attached on the day of surgery. The waiting period before fitting allows the bone to integrate firmly with the implant. The timing varies:

• For percutaneous systems in adults, fitting is commonly between three weeks and three months after surgery, depending on the system and the surgeon's protocol. Some modern implants allow earlier loading.
• For transcutaneous systems, fitting is generally a few weeks after surgery, once the skin has healed.
• For children, fitting times may be slightly longer to allow safe osseointegration.

At the fitting appointment, the audiologist programs the sound processor to your specific hearing profile, shows you how to attach and remove it, change batteries or charge it, and care for the device. Most users find the initial sound experience takes some adjustment — familiar voices and sounds can seem different at first, and the brain adapts over the following weeks and months.

Long-term healing

Full osseointegration continues over several months. During this period, follow-up visits monitor the implant, the skin around it (for percutaneous systems), and the programming of the sound processor.

Risks and Complications

BAHA surgery is generally well tolerated, but as with any operation, there are risks to weigh. Your surgeon will discuss the specific risks that apply to your situation. Commonly described complications include:

Skin reactions around the abutment (percutaneous systems)

The most common issue with percutaneous BAHA is skin inflammation around the post, sometimes called peri-abutment dermatitis. This ranges from mild redness to significant infection. Most cases respond to topical treatment, antibiotics, and improved cleaning. A small number require minor revision surgery.

Failure of osseointegration

In a small percentage of cases, the titanium does not bond firmly with the bone and the implant becomes loose. This is more common in children, in patients who have had radiotherapy to the area, and in those with certain bone or healing conditions. If it occurs, the implant may need to be removed and a new one placed at a slightly different site.

Implant extrusion or loss

Rarely, the implant works itself out of the bone, often related to trauma. The implant is replaced after the area has healed.

Skin overgrowth (transcutaneous systems)

For transcutaneous systems, skin under the magnet can sometimes become irritated, thin, or break down, particularly if the magnet is too strong for the individual's skin. This is usually managed by adjusting the magnet strength or using a protective pad.

Numbness

Numbness of the skin around the implant site is common in the first weeks and usually improves, though a small patch of altered sensation may persist.

Pain or discomfort

Persistent pain at the implant site is uncommon and warrants review.

Surgical risks

General surgical risks apply: bleeding, infection of the wound, and reactions to anaesthesia. Damage to important structures behind the ear, such as the facial nerve or the dura (the lining of the brain), is very rare in experienced hands because the implant site is chosen well away from these structures.

Device limitations

Not a complication exactly, but worth mentioning: the BAHA does not restore normal hearing. It improves access to sound for the conditions it treats, and most users find it makes a significant difference, but it does not replicate the way a normal ear works.

Life After a BAHA

Once the device is fitted and you have adjusted to it, day-to-day life with a BAHA is straightforward for most people, with a few specific considerations.

Wearing the device

The sound processor is taken off at night and during activities like swimming or showering (unless it is a water-resistant model used with protection). Most users wear it during all waking hours.

Daily care

For percutaneous systems, daily cleaning of the skin around the abutment is important to prevent inflammation. Most centres provide written guidance and a demonstration. For transcutaneous systems, the skin under the magnet may need occasional checking but does not require special daily cleaning.

The sound processor needs routine care: changing or charging batteries, keeping it dry, cleaning the microphone ports, and bringing it in for service or reprogramming as advised.

Activities and sports

Most physical activities can be resumed, including running, swimming (with the processor removed), and most sports. Contact sports where head impact is likely — boxing, certain martial arts, rugby — need a discussion with the surgeon. Helmets used in cycling, cricket, or motorcycling can usually be adapted or chosen to accommodate the implant.

MRI scans

This is an important practical point. Most percutaneous BAHA implants are MRI-compatible, though the abutment and processor are removed before the scan and the area near the implant may show an artefact on the image. Magnetic transcutaneous implants have more variable MRI compatibility — some require the magnet to be surgically removed before MRI, and others are now designed to allow scanning at certain field strengths. You will be given a device card explaining your specific implant's MRI status. Always show this to any radiology team before a scan.

Air travel and security

The implant may set off metal detectors. Carrying your device identification card avoids difficulty at airport security.

Upgrading the processor

One advantage of the BAHA system is that the implant itself stays in place long-term, while the external sound processor can be upgraded as technology improves. Most users keep their implant for many years and replace the external processor when newer models with better features or improved battery life become available.

Communication strategies

Many BAHA users continue to benefit from broader hearing strategies — positioning themselves to see the speaker, asking for repetition when needed, using assistive listening devices that stream directly to the processor, and informing colleagues or teachers about their hearing. Audiologists can help with these.

BAHA in Children

Bone-anchored hearing systems are widely used in children, particularly for congenital conductive hearing loss due to microtia and aural atresia (an underdeveloped or absent ear canal), chronic middle ear disease, or single-sided deafness present from birth. Paediatric considerations differ from adult care in several ways.

Softbands in infancy and early childhood

Hearing access matters from the earliest months for language development. Babies and toddlers who are candidates for a future BAHA are typically fitted with a softband early — sometimes in the first months of life. The softband holds a sound processor against the head and gives the child access to speech sounds while the skull is too thin for safe implantation.

Audiologists work closely with the family to fit, programme, and monitor the softband, and to support speech and language development alongside the parents and speech therapists.

Timing of implantation

Surgery is usually deferred until the skull bone is thick and stable enough to anchor the implant. Many centres consider implantation from around three to five years of age, with some variation. Imaging is used to confirm bone thickness before surgery.

Surgical considerations

Children are usually operated on under general anaesthesia. Smaller or shorter implants may be used in younger children. Surgeons take care to position the implant where it will still work well as the child's head grows.

School and communication

Children with BAHA benefit from school-based support: preferential seating, FM systems or direct-streaming accessories that send the teacher's voice to the processor, and good acoustics in the classroom. Many schools work with the family and audiologist to put these in place.

Follow-up

Paediatric patients need close audiological follow-up as they grow, both to track hearing development and to support adjustments to the device. Skin care education is a shared task between the child, parents, and the clinical team.

Outcomes

For children with congenital conductive hearing loss, early bone conduction sound access (first with softbands and later with implants) has been associated with better speech and language outcomes than late-treated hearing loss. Specific outcomes for your child are something to discuss with the paediatric ENT team and audiologist.

Frequently Asked Questions

Will I hear normally with a BAHA?

A BAHA does not restore normal hearing in the strict sense. What it does is give you reliable access to sound that you could not get to before — or could not get to comfortably with a conventional hearing aid. Most users describe a clear, helpful improvement, particularly for understanding speech. The brain takes time to adjust to bone-conducted sound, and most people find the experience improves over the first weeks and months.

Is the surgery painful?

The procedure itself is not felt because of anaesthesia. Afterwards, most patients describe mild discomfort or a dull ache for a few days, well controlled with simple pain medication. Severe pain is unusual.

Can I sleep on the side of the implant?

Once healing is complete, most people sleep comfortably on either side. The external processor is removed at night.

How long does the implant last?

The titanium implant itself is designed to last many years, often a lifetime. The external sound processor has a shorter functional life and is typically upgraded or replaced periodically as technology improves or the device wears.

Can the implant be removed if I change my mind?

Yes. If a BAHA implant is no longer needed or wanted, it can be removed in a minor procedure. The bone heals over.

What happens if I get an infection around the abutment?

Mild skin inflammation around a percutaneous abutment is fairly common and usually settles with improved cleaning and topical or oral antibiotics. More significant infections may need a clinic visit and, very rarely, revision surgery. Your team will explain warning signs to look out for.

Can I swim or shower with the device?

The implant itself is unaffected by water once healed. The external processor is removed before swimming or showering, unless it is a water-resistant model used with appropriate accessories. Some users keep a swimming-safe processor or cover.

Can I use a phone normally?

Yes. Most modern BAHA processors connect to mobile phones via Bluetooth, allowing direct streaming of calls. Many also stream music, television audio, and other media.

Will the implant be visible?

For percutaneous systems, the abutment is a small post visible behind the ear, especially with short hair. The sound processor is small but visible when worn. Transcutaneous systems leave no visible post when the processor is off. Many users find that hair covers the device naturally; others are comfortable with the device being seen.

Can a BAHA be done on both sides?

Yes. Bilateral BAHA implantation is offered when both ears have suitable conductive or mixed hearing loss and binaural hearing benefit is expected. The decision is individual and discussed with the audiologist and surgeon.

Is a BAHA the same as a cochlear implant?

No. A cochlear implant bypasses a damaged cochlea and stimulates the hearing nerve directly with electrical signals; it is used for severe to profound sensorineural hearing loss. A BAHA uses bone conduction to deliver sound to a working cochlea; it is used for conductive, mixed, or single-sided hearing loss. The two devices are designed for different problems.

Conclusion

A bone-anchored hearing aid is an established option for people whose hearing loss is not well served by conventional hearing aids — chronic ear disease, atresia and microtia, certain mixed losses, and single-sided deafness among the main indications. The surgery is short, the recovery is generally straightforward, and the implant itself can last many years while the external sound processor is updated over time.

The decision about whether a BAHA is the right approach, which type of system suits you, and when to proceed is one made together with an ENT surgeon and an audiologist, based on your hearing profile, anatomy, lifestyle, and preferences. A softband trial before surgery, careful discussion of percutaneous versus transcutaneous options, and a clear understanding of long-term care all help in arriving at the right choice. With that preparation in place, most BAHA users report meaningful improvements in their day-to-day hearing and communication.