Stapedectomy

A stapedectomy is a surgical procedure designed to improve hearing when the stapes, one of the three tiny bones in the middle ear, has become abnormally fixed. The stapes normally transfers vibrations from the incus to the inner ear, but otosclerosis can restrict its movement and cause conductive hearing loss. During surgery, the surgeon removes the abnormal stapes structure or an appropriate portion of it and uses a prosthesis to create a new pathway for sound transmission.

The procedure is most commonly associated with otosclerosis, although the appropriate surgical approach depends on the underlying condition and the anatomy of the middle ear. Stapedectomy is typically performed as an outpatient procedure, allowing many patients to return home the same day, although the exact surgical and recovery plan varies from patient to patient.

The stapes is the smallest bone in the human body and one of three small bones, called the ossicles, located in the middle ear. The malleus, incus, and stapes work together to transfer vibrations from the eardrum toward the inner ear.

The stapes sits at the connection between the middle ear and the inner ear. Its movement is essential for transmitting sound energy through the oval window and into the cochlea, where sound is converted into signals that can be interpreted by the brain. When otosclerosis causes the stapes to become fixed, this mechanical pathway is disrupted and conductive hearing loss can occur.

A stapedectomy is generally performed when otosclerosis has caused conductive hearing loss and the patient may benefit from surgically restoring the mechanical transmission of sound. The procedure is intended to bypass the part of the stapes that is no longer moving normally rather than simply amplifying sound.

Not everyone with otosclerosis needs surgery. Some people have mild hearing loss that can be managed effectively with hearing aids, while others may prefer amplification instead of surgery. The decision depends on the degree and type of hearing loss, the condition of the middle and inner ear, the patient’s overall health, communication needs, and personal treatment preferences. NIDCD identifies both hearing aids and stapes surgery as treatment options for otosclerosis.

Otosclerosis is caused by abnormal bone remodeling within the ear. When this process affects the stapes, the bone can become less mobile or fixed in position. Because the stapes is responsible for transferring sound vibrations into the inner ear, restricted movement reduces the efficiency with which sound reaches the cochlea.

This typically produces conductive hearing loss, although some people with otosclerosis can also develop a sensorineural component. A hearing evaluation can determine whether the hearing loss is conductive, sensorineural, or mixed, which is important when considering whether stapes surgery is appropriate.

Stapedectomy and stapedotomy are related surgical procedures used to treat conductive hearing loss associated with otosclerosis. The primary difference is how the surgeon addresses the stapes and its footplate.

In a stapedectomy, part or most of the stapes footplate is removed and a prosthesis is used to transmit sound into the inner ear. In a stapedotomy, the surgeon creates a small opening, or fenestra, in the stapes footplate and places a prosthesis through that opening. Stapedotomy is currently performed more commonly than traditional stapedectomy in many settings, although the appropriate technique depends on the individual patient’s anatomy and the surgeon’s assessment. The two procedures share the same fundamental goal: bypassing the abnormal portion of the stapes and restoring the transmission of sound to the inner ear. Your ear surgeon can explain which technique is appropriate for your condition and why.

The ideal candidate for stapes surgery generally has conductive hearing loss consistent with otosclerosis and an evaluation showing that the middle-ear mechanics are contributing significantly to the hearing problem. The decision also takes into account the health of the inner ear, the patient’s overall medical history, previous ear surgery, hearing needs, and expectations for treatment.

A complete evaluation typically includes an audiogram and assessment of middle-ear function. Your physician may also consider imaging or additional testing when the diagnosis is uncertain or when more information about the anatomy of the ear is needed. NIDCD notes that audiometry and tympanometry are commonly used when evaluating otosclerosis, with CT imaging sometimes used as well.

Before recommending stapes surgery, your ENT physician and audiologist need to establish that otosclerosis or another middle-ear disorder is responsible for the hearing loss. The evaluation usually begins with a detailed history and physical examination followed by hearing testing.

Depending on your symptoms and clinical findings, testing may include:

• Pure-tone audiometry
• Bone-conduction and air-conduction testing
• Speech recognition testing
• Tympanometry
• Examination of the ear canal and eardrum
• Additional audiologic testing when indicated
• CT imaging in selected cases

The hearing evaluation helps determine the type and degree of hearing loss and whether there is a significant conductive component that could potentially be improved through stapes surgery.

Stapedectomy is performed through the ear canal using specialized instruments designed for delicate middle-ear surgery. The surgeon carefully accesses the middle ear, addresses the abnormal stapes, and places a small prosthesis that connects the remaining ossicular chain to the inner ear’s oval window region.

The goal is to create a stable pathway that allows sound vibrations to travel more effectively into the inner ear. The procedure typically takes about an hour, although operative time can vary based on the patient’s anatomy, surgical findings, and the specific technique used. The current practice describes its stapedectomy procedures as outpatient surgery.

Stapedectomy and related stapes procedures are commonly performed on an outpatient basis. This means that, when appropriate, patients can generally return home after recovering from the procedure rather than staying overnight in the hospital.

Your individual discharge instructions will depend on the procedure, anesthesia, medical history, and how you are recovering immediately after surgery. You should arrange for transportation and follow the surgical team’s instructions regarding medications, activity, and postoperative care.

Recovery after stapes surgery is gradual. The ear may feel blocked or full during the early healing period, and hearing may not improve immediately. Temporary changes in hearing, mild discomfort, altered taste, or balance symptoms can occur as the ear heals.

Hearing improvement generally becomes more apparent over the weeks following surgery rather than immediately after the procedure. The current practice reports that many patients experience significant hearing improvement by approximately the fourth week, although individual recovery times and hearing outcomes vary.

Follow-up appointments are important because your physician needs to monitor healing and evaluate your hearing after surgery. Your surgeon will also provide specific instructions about keeping the ear dry, physical activity, flying, pressure changes, and other aspects of recovery.

Hearing improvement after stapes surgery is not necessarily immediate. Packing or temporary changes within the ear can initially make hearing seem reduced, and the middle ear needs time to heal after the procedure.

Many patients notice meaningful improvement during the first several weeks, with the current practice noting that significant improvement is often apparent by around four weeks. The timing varies, however, and the final hearing result depends on the extent of the otosclerosis, the condition of the inner ear, the surgical anatomy, and other factors.

Stapes surgery is an established treatment for conductive hearing loss caused by otosclerosis, and appropriately selected patients can experience substantial improvement in hearing. Surgical success is generally evaluated through postoperative hearing testing, including the change in the difference between air- and bone-conduction thresholds.

The degree of hearing improvement varies from person to person. Surgery is designed to address the conductive component caused by abnormal stapes movement, so patients who also have sensorineural hearing loss may continue to have some hearing difficulty after a technically successful procedure. Clinical literature also emphasizes that surgeon experience is an important factor in outcomes.

The primary purpose of stapedectomy is to improve hearing by restoring more efficient sound transmission through the middle ear. For appropriate candidates, improved hearing can make speech and everyday sounds easier to access and may reduce reliance on amplification.

Potential benefits include:

• Improved conductive hearing
• Better access to speech and environmental sounds
• Reduced dependence on hearing aids for some patients
• Improved communication in everyday situations
• A long-term surgical approach to hearing loss caused by stapes fixation

The degree of benefit depends on the patient’s hearing profile and the condition of the inner ear. Surgery cannot guarantee normal hearing, and additional hearing technology may still be useful when a sensorineural component remains.

Stapedectomy is performed near delicate structures responsible for hearing and balance, so the procedure carries potential risks. Your surgeon should discuss these risks with you before surgery and explain how they relate to your individual anatomy and hearing condition.

Potential risks and complications may include:

• Incomplete hearing improvement
• Persistent conductive hearing loss
• Sensorineural hearing loss
• Rarely, significant or profound worsening of hearing
• Temporary or persistent dizziness or imbalance
• Tinnitus
• Taste disturbance
• Problems involving the prosthesis
• Infection or other surgical complications
• The need for revision surgery

NIDCD specifically notes that some hearing loss may persist following stapedectomy and that, in rare cases, surgery can worsen hearing.

Although the goal of stapedectomy is to improve hearing, no ear surgery can guarantee a particular result. The structures involved are extremely delicate, and complications can occasionally result in persistent or worsening hearing loss.

This is why appropriate patient selection and careful preoperative evaluation are important. Your surgeon should review your audiogram, middle-ear findings, medical history, and other relevant factors before recommending surgery and should explain the potential benefits and risks during your consultation.

Tinnitus can occur in people with otosclerosis, and some patients may notice changes in tinnitus after treatment of the underlying conductive hearing loss. However, stapes surgery should not be presented as a guaranteed treatment for tinnitus.

Tinnitus can have multiple causes, and its course after surgery varies. If tinnitus is one of your primary concerns, discuss it with your physician so that it can be considered as part of your overall treatment plan.

Stapes surgery is intended primarily to improve hearing rather than treat balance disorders. Some people with otosclerosis experience dizziness or balance symptoms, but these symptoms can have multiple causes and should be evaluated separately when appropriate.

Temporary dizziness or imbalance can also occur after ear surgery. Your surgeon will provide guidance about what symptoms are expected during recovery and when you should contact the office for further evaluation.

For people with otosclerosis, both hearing aids and stapes surgery can be legitimate treatment options. Hearing aids improve hearing by amplifying and processing sound, while stapes surgery addresses the mechanical problem that prevents sound from being transmitted normally through the middle ear.

The choice between surgery and hearing aids depends on the severity and type of hearing loss, the condition of the inner ear, medical considerations, lifestyle, and personal preference. Some patients prefer a non-surgical approach, while others may want to address the underlying conductive hearing loss surgically. An audiologist and ear surgeon can help you compare the expected benefits and limitations of each option based on your hearing test results.

When hearing aids do not provide the expected benefit, it is important to determine why. The problem may be related to hearing aid programming, an incorrect fit, progression of hearing loss, an untreated middle-ear condition, or a hearing loss that is not adequately addressed by conventional amplification.

For patients with otosclerosis, the evaluation may reveal a conductive component that could potentially be addressed through stapes surgery. For other patients, continued hearing aid optimization, additional hearing technology, or another form of hearing treatment may be more appropriate.

The current practice describes stapedectomy as an outpatient procedure that typically takes approximately one hour. Actual operating time can vary depending on the surgical technique, the patient’s anatomy, and findings during the procedure.

The total time spent at the surgical facility will be longer than the operating time because it includes preparation, anesthesia, recovery, and postoperative instructions. Your surgical team can provide more specific information about what to expect on the day of your procedure.

Stapes surgery may be worth discussing when testing indicates conductive hearing loss consistent with otosclerosis and the hearing difficulty is affecting your daily communication. It can also be considered when a patient wants an alternative to long-term hearing aid use and is an appropriate surgical candidate.

A consultation does not necessarily mean that surgery is required. Your physician can review your hearing results and discuss observation, hearing aids, stapedectomy, stapedotomy, or other treatment options so that you can make an informed decision.