Otosclerosis, When Bone Causes Hearing Loss

Hearing loss treatment has come a long way — and most types are treatable if caught early. Otosclerosis treatment is something I see regularly in my practice. Namaste. I’m Dr. Prateek Porwal, DNB ENT, MBBS from Prime ENT Center in Hardoi, Uttar Pradesh. Today, I want to discuss a condition that affects young and middle-aged adults, particularly women, and causes a uniquely treatable form of hearing loss: otosclerosis, a disorder where abnormal bone remodeling in the middle ear gradually fixes the stapes bone in place, progressively stealing hearing.

Here’s what makes otosclerosis fascinating, and tragic if left untreated: it’s one of the most rewarding conditions to treat in all of otolaryngology (ENT). A patient comes in with progressive hearing loss, we perform a definitive surgical procedure (stapedectomy), and their hearing is often restored to near-normal levels. Yet many patients don’t know this condition exists, suffer silently with progressive hearing loss, and miss out on the opportunity for life-changing surgery.

In this article, I’ll explain the physiology of otosclerosis, help you recognize if you might have it, discuss the gold-standard surgical treatment, and address the unique challenge of otosclerosis during pregnancy, a critical topic for young women with this condition.

Understanding Otosclerosis Treatment

Understanding the Anatomy, The Three Bones of Hearing

Before diving into otosclerosis, let me explain the ear’s anatomy. Your middle ear contains three tiny bones (ossicles) that transmit sound vibrations from your eardrum to the inner ear.

• Malleus (hammer): Attached to the eardrum, vibrates when sound hits.
• Incus (anvil): In the middle, transfers vibrations.
• Stapes (stirrup): The smallest bone in the human body (about 3 mm long), inserted into the oval window (opening of the inner ear). The stapes is our focus.

These three bones work together like a mechanical lever system, amplifying sound vibrations by about 30 times before they reach the cochlea (the inner ear’s hearing organ). This mechanical amplification is important for normal hearing.

What Is Otosclerosis? The Pathophysiology

Otosclerosis is abnormal bone remodeling in the middle ear, typically at the oval window where the stapes sits. In normal bone, there’s a balance between bone formation and bone resorption. In otosclerosis, this balance is disrupted, leading to excessive new bone growth around the stapes footplate.

The consequence: The stapes gradually becomes fixed (immobilized) in the oval window. Instead of vibrating freely to transmit sound to the inner ear, the stapes can’t move. Sound vibrations stop at the eardrum-ossicle junction, causing conductive hearing loss, the mechanical amplification system fails.

Important distinction: Otosclerosis initially causes conductive hearing loss (bone conduction is normal, air conduction is impaired). However, in advanced cases, the pathology can extend into the cochlea itself, causing sensorineural hearing loss (the inner ear is damaged). This mixed hearing loss pattern is called cochlear otosclerosis.

Why Does Otosclerosis Happen? The Etiology

The exact cause isn’t fully understood, but several factors are implicated:

• Genetics: Strong familial tendency. If a parent has otosclerosis, your risk is 25-50%. If both parents, the risk is very high. Some genes implicated include OTSC genes (OTSC1-10).
• Female predominance: Women are affected 2-3 times more often than men. Hormonal factors (estrogen) are believed to play a role.
• Age of onset: Typically appears in the 2nd-4th decade (20-40 years). Rarely in children or the elderly.
• Pregnancy exacerbation: Pregnancy accelerates otosclerosis progression, sometimes dramatically. We’ll discuss this further below.
• Metabolic factors: Abnormalities in bone metabolism, vitamin D status, and parathyroid hormone may contribute.
• Inflammatory factors: Some research suggests chronic inflammation plays a role.

Clinical Presentation, How Otosclerosis Announces Itself

The classic presentation of otosclerosis is distinctive, allowing experienced clinicians to suspect the diagnosis before testing:

Progressive Bilateral Hearing Loss

Key feature: The hearing loss is usually bilateral (affects both ears), though often one ear is worse than the other. The progression is usually gradual, over months to years, but can sometimes be more rapid.

Patients often report:

• “I’m having trouble hearing people in noisy restaurants”
• “Phone conversations are becoming difficult”
• “I need to turn up the TV volume”
• “I hear people talking, but the words are muffled”

The hearing loss is conductive, meaning bone conduction is preserved. This is diagnostically important.

Age and Demographics

Typically a young adult (20s-40s) comes to me with progressive hearing loss. In India, young married women sometimes present because they’re noticing hearing difficulty during their pregnancy or shortly after childbirth, a red flag for otosclerosis.

Young men can have it too, but the female predominance is striking.

Paracusis Willisii, A Paradoxical Symptom

Here’s a fascinating symptom that’s pathognomonic (specific) for otosclerosis: paracusis Willisii, the patient hears better in noisy environments than in quiet ones.

How does this happen?

• In otosclerosis, the stapes is fixed, so air-conducted sound (normal speech pathway) is impaired.
• However, bone-conducted sound (vibrations through the skull) bypasses the ossicular chain and reaches the cochlea directly.
• In noisy environments, people raise their voices and speak loudly. These louder sound waves have greater bone-conducting components.
• , in a noisy background, people’s normal conversational speech is less audible to everyone, so the patient doesn’t notice their hearing loss as much.
• The patient thus perceives better hearing in noise.

This paradoxical symptom, “I hear better when people are shouting” or “I hear better in the market than in a quiet room”, is highly suggestive of otosclerosis.

Associated Symptoms

• Tinnitus: Ringing or buzzing in the ears, present in about 75% of otosclerosis patients. Often low-frequency tinnitus.
• Vertigo or dizziness: Less common (20-30%), but can occur, particularly if the disease extends into the inner ear (cochlear otosclerosis).
• No ear discharge or infection: Otosclerosis is a “dry” disease, no drainage, no active infection. The ear canals are normal.

Diagnosis of Otosclerosis, Clinical and Investigative

Diagnosing otosclerosis requires a combination of clinical assessment and specialized testing.

Otoscopic Examination

The eardrum appears completely normal. This is important, if the eardrum looks abnormal, otosclerosis is unlikely. The normality of the external ear and eardrum contrasts with the hearing loss, a key clue.

Audiometry (Hearing Tests)

This is the foundation of diagnosis. Audiometry reveals specific patterns characteristic of otosclerosis:

• Conductive hearing loss: Air conduction (AC) is worse than bone conduction (BC). The AC-BC gap is typically 30-50 dB, a significant air-bone gap.
• Carhart’s notch: A distinctive dip in bone conduction at 2000 Hz (2 kHz). This 5-10 dB notch at this specific frequency is highly specific for otosclerosis. It’s named after pioneering audiologist Raymond Carhart.

The combination of air-bone gap and Carhart’s notch is highly suggestive of otosclerosis.

Tympanometry

This test measures middle ear compliance. In otosclerosis, the stapes is fixed, so the middle ear is stiff. Tympanography typically shows an As pattern, normal middle ear pressure and volume, but reduced compliance (stiffness). This helps distinguish otosclerosis from other causes of conductive hearing loss (like ossicular discontinuity).

CT Scan (High-Resolution CT of the Temporal Bone)

CT imaging can visualize otosclerotic foci, the areas of abnormal bone growth. Fenestral otosclerosis is the most common type, with bone growth specifically at the oval window (the stapes footplate). Cochlear otosclerosis involves bone growth in the cochlear region.

CT is useful for:

• Confirming the diagnosis
• Identifying cochlear involvement
• Assessing the extent of disease
• Surgical planning

However, CT is not always necessary for diagnosis if clinical and audiometric findings are classic.

The Pregnancy Connection, A Critical Issue for Young Women

One of the most important facts about otosclerosis is its acceleration during pregnancy. This is not merely a medical curiosity, it has profound implications for family planning and treatment decisions in young women.

Why Does Pregnancy Worsen Otosclerosis?

The exact mechanism isn’t fully understood, but several factors are implicated:

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• Hormonal changes: Estrogen and progesterone levels rise dramatically during pregnancy. These hormones may stimulate bone remodeling, accelerating otosclerotic foci growth.
• Altered calcium and phosphate metabolism: Pregnancy increases calcium demands for fetal development. Changes in parathyroid hormone and vitamin D metabolism may affect bone remodeling.
• Increased blood volume and cardiovascular demands: The increased blood flow and cardiac output of pregnancy may increase vibrations through bone, stimulating remodeling.
• Immune system changes: Pregnancy alters immune function, possibly affecting inflammatory components of otosclerosis.

The Clinical Reality

In my practice, I’ve seen young women whose hearing was stable suddenly deteriorate during pregnancy, sometimes dramatically. A woman might have had hearing loss stable for years, then during pregnancy lose another 20-30 dB of hearing over a few months.

Key observations:

• Hearing loss can accelerate significantly during pregnancy, sometimes causing rapid progression that would normally take years.
• Hearing loss may continue to worsen in the postpartum period.
• The greater the number of pregnancies, the greater the overall progression of hearing loss.
• Some women experience significant hearing loss during their first pregnancy, while others have more stable courses.

Implications for Family Planning

Young women with otosclerosis face a difficult decision: Should they pursue surgery now (while hearing is still reasonably good) or wait and risk rapid deterioration during future pregnancies?

My counsel to young women with otosclerosis:

• If planning pregnancy in the near future (within 1-2 years): Consider stapedectomy before pregnancy if hearing loss is significant. The pregnancy-related acceleration may be prevented or minimized by correcting the stapes fixation surgically first.
• If not planning pregnancy soon: Observe with periodic hearing testing. Surgery can be deferred, but counsel the patient about pregnancy-related risks.
• If pregnant and newly diagnosed with otosclerosis: Management is complex. Surgery during pregnancy is generally avoided due to anesthetic risks, but hearing aids may be necessary. Postpartum assessment and surgical planning can then occur.
• Regarding contraception: Some women with otosclerosis ask if oral contraceptives (OCPs) might prevent progression. There’s no strong evidence that OCPs prevent otosclerosis progression, and I don’t recommend them for this indication.

Treatment of Otosclerosis, Medical vs. Surgical

This is where otosclerosis treatment differs significantly from many other ear conditions.

Medical Treatment, Limited Role

Fluoride therapy: Historically, sodium fluoride was used to inhibit bone remodeling and slow otosclerosis progression. While there’s some evidence it may slow progression, it doesn’t arrest the disease, and it requires long-term therapy with potential side effects. In modern practice, fluoride is rarely used.

Vitamins and minerals: Supplemental calcium and vitamin D are sometimes recommended, but evidence for slowing otosclerosis is weak.

The bottom line: There is no effective medical treatment that reverses otosclerosis or reliably halts progression.

Hearing Aids, Symptom Management Without Cure

For patients who cannot or choose not to have surgery, hearing aids are an option. Properly fitted hearing aids can significantly improve communication and quality of life, even with conductive hearing loss.

Advantages:

• Non-invasive, reversible
• Can be fitted at any severity of hearing loss
• Technology is excellent now (digital, Bluetooth-enabled)

Disadvantages:

• Expensive (+ depending on type and features)
• Requires ongoing maintenance and fitting adjustments
• Social stigma in some cultures (though this is changing)
• Does not address the underlying disease progression
• Hearing aids don’t work well if hearing loss is severe

Stapedectomy, The Gold Standard Surgical Treatment

Stapedectomy (or stapedotomy) is the definitive treatment for otosclerosis. This is a microsurgical procedure to remove the fixed stapes and replace it with an artificial prosthesis, restoring ossicular chain mobility and sound transmission.

How Stapedectomy Works

Under general or local anesthesia, with an operating microscope:

1. Endaural or postauricular incision: The surgeon accesses the middle ear through an incision in the ear canal (endaural) or behind the ear (postauricular).
2. Tympanomeatal flap: The eardrum is lifted to expose the ossicles.
3. Remove the fixed stapes: The surgeon carefully removes the stapes footplate (the part fixed in the oval window). This is the most delicate part, as the oval window is the opening to the inner ear, and any damage could cause permanent inner ear damage.
4. Insert the prosthesis: An artificial stapes prosthesis (made of stainless steel, plastic, or other materials) is positioned, with one end on the incus and the other in the oval window.
5. Secure and seal: The prosthesis is secured, and a tissue graft (fat, connective tissue) seals the oval window.
6. Close the eardrum: The eardrum is repositioned and sutured.

Success Rates

Stapedectomy has the highest success rate of any otologic surgical procedure.

• Air-bone gap closure: 90-95% of patients have air-bone gap closure (improvement in air conduction to near-normal levels).
• Hearing improvement: Most patients regain 20-30 dB of hearing. Some achieve near-normal hearing.
• Stapedectomy in the first ear: Success rate is about 90-95%.
• Stapedectomy in the second ear: If the first ear is successful, second ear surgery has similar or slightly lower success rates (85-90%).

These are exceptional results. Few surgical procedures restore function this reliably.

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Risks and Complications

While stapedectomy is generally safe, complications can occur:

• Sensorineural hearing loss (SNHL): The most feared complication, permanent damage to the inner ear during surgery, causing hearing loss. Occurs in 1-3% of cases. Most loss is modest (10-20 dB), but severe loss is possible.
• Tinnitus: New tinnitus or worsening of existing tinnitus occurs in some patients. Usually temporary, but can be permanent.
• Vertigo: Temporary dizziness after surgery is common and usually resolves within days to weeks. Persistent vertigo is rare.
• Taste disturbance: The chorda tympani nerve (carries taste from anterior 2/3 of tongue) runs through the middle ear. Temporary taste changes affect about 30% of patients; permanent changes occur in 5-10%.
• Prosthesis displacement: Rare, but the prosthesis can shift or become dislodged, requiring revision surgery.
• Conductive hearing loss recurrence: Rarely, otosclerosis can recur (restapedosis), causing hearing loss again. Revision surgery is possible.
• Infection or eardrum perforation: Rare with modern surgical techniques.
• Facial nerve damage: Extremely rare with careful technique, but the facial nerve runs through the temporal bone.

Risk stratification: Patients with cochlear otosclerosis (inner ear involvement) have higher risk of sensorineural hearing loss with surgery. In these cases, the decision to proceed with surgery requires careful counseling about risks vs. benefits.

Timing of Surgery

When should stapedectomy be performed?

• Significant hearing loss with functional impairment: When hearing loss is interfering with work, education, or communication, typically air-bone gap >30 dB.
• Patient desire and expectations: The patient must understand the risks and have realistic expectations.
• Age and health status: Generally safe at any age, but usually performed in younger patients who have more years to benefit from the restored hearing.
• Unilateral vs. bilateral: Usually the ear with worse hearing is treated first.

Controversial timing: Some patients ask, “Should I wait until it gets worse?” My answer: Once otosclerosis is advanced, surgical success may be lower, and risks may be higher. , prolonged hearing loss during childhood or adolescence can affect speech development and educational outcomes. But this is an individualized decision.

Otosclerosis Treatment in India, Costs and Availability

One question many patients ask: “Where can I get stapedectomy in India, and what will it cost?”

Availability

Stapedectomy is performed at major ENT centers across India:

• Government institutions: AIIMS Delhi, JIPMER Puducherry, CMC Vellore, and other major teaching hospitals
• Private institutions: Large private hospitals in metro cities (Delhi, Mumbai, Bangalore, Chennai) and increasing availability in tier-2 cities
• Up to Uttar Pradesh: Major medical centers in Lucknow, Varanasi, and other larger towns. At Prime ENT Center in Hardoi, we can refer patients to excellent surgical centers in the region or nearby metros.

Surgeon expertise matters: Stapedectomy requires specialized training and experience with an operating microscope. Not all ENT surgeons perform this procedure regularly. It’s worth seeking out surgeons with significant experience.

Cost of Stapedectomy in India

Price range (approximate, as of 2025):

• Government hospital: (minimal cost, essentially subsidized)
• Private hospital: + depending on location, hospital reputation, surgeon expertise, and whether it’s unilateral or bilateral surgery

What this typically includes: Preoperative evaluation, surgery, anesthesia, operating room, postoperative care, and follow-up visits for 2-4 weeks.

Additional costs: Prosthesis material (some hospitals provide; others charge separately), medications, and any revision surgery if needed.

Insurance coverage: Many insurance plans cover stapedectomy for otosclerosis, but it varies. Check with your insurer.

Accessibility in Smaller Towns

The reality is that specialization is concentrated in metros. If you live in Hardoi or other smaller towns in UP, you may need to travel to Lucknow or even Delhi/NCR for surgery. This travel and accommodation cost should be factored in.

This is a limitation of Indian healthcare that affects many specialized procedures. I counsel patients to consider the total cost (surgery + travel) and plan accordingly. Many patients find it worthwhile given the life-changing nature of the surgery.

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FAQs, Your Questions About Otosclerosis Answered

1. Is otosclerosis hereditary? What’s my child’s risk?

Yes, otosclerosis has strong genetic basis. If one parent has otosclerosis, your child’s risk is 25-50%. If both parents, risk is very high (up to 75-100%). However, genetics is not deterministic, not all children of affected parents develop otosclerosis. No gene test can predict whether a specific child will develop it. Genetic counseling is available if family planning is a concern.

2. Can otosclerosis cause sudden hearing loss?

Otosclerosis typically causes gradual progressive hearing loss. However, rapid progression (over weeks to months) can occur, especially during pregnancy or under stress. Truly sudden hearing loss (acute unilateral loss) is not typical of otosclerosis and suggests a different cause (sudden sensorineural hearing loss from viral infection, acoustic neuroma, etc.). If you experience sudden hearing loss, seek urgent evaluation.

3. My friend had stapedectomy and had taste problems. Will that happen to me?

Taste disturbance is common but usually temporary. About 30% of patients report some taste change after stapedectomy, but most resolve within weeks to months. Permanent taste disturbance affecting quality of life occurs in only 5-10%. The taste nerve (chorda tympani) runs through the middle ear and may be irritated or stretched during surgery. Most surgeons carefully handle this nerve to minimize problems. Accept this risk, but know it’s usually not severe or permanent.

4. Can otosclerosis affect only one ear?

Otosclerosis is usually bilateral (affects both ears), though often asymmetrically (one ear worse than the other). Truly unilateral otosclerosis (one ear only) is uncommon. If hearing loss is present in only one ear, investigate for other causes as well (acoustic neuroma, sudden sensorineural hearing loss, etc.).

5. Is there any non-surgical treatment that can help?

Unfortunately, no. Medical treatments (fluoride, vitamins) have limited evidence and don’t reliably stop otosclerosis. Hearing aids can help manage hearing loss but don’t address the underlying disease. Surgery (stapedectomy) is the only definitive treatment that addresses the root cause and restores hearing.

6. If I have otosclerosis and want children, what should I do?

This is a complex decision requiring counseling about two issues: (1) Genetic risk to offspring (25-50% chance of inheriting otosclerosis if you’re affected), and (2) Pregnancy-related hearing loss acceleration in yourself. Many women with otosclerosis have children without major issues, but accelerated hearing loss during pregnancy is possible. Some choose to have stapedectomy before pregnancy to minimize this risk. There’s no right or wrong answer, it’s an individualized decision made with your doctor.

7. What’s the difference between stapedectomy and stapedotomy?

Stapedectomy removes the entire stapes footplate; stapedotomy makes a small opening in the footplate and inserts a prosthesis through it, preserving some footplate. Stapedotomy is gaining popularity as it may slightly reduce the risk of inner ear damage. Both techniques have excellent success rates.

8. If my stapedectomy fails (hearing loss recurs), can I have revision surgery?

Yes. Rarely, the otosclerotic disease recurs (restapedosis), causing hearing loss again. Revision stapedectomy can be performed. Success rates are slightly lower than primary surgery (80-85%), but hearing improvement is still usually good. , prosthesis displacement or other mechanical problems can sometimes be revised.

Looking Forward, Life After Stapedectomy

For patients who undergo successful stapedectomy, the transformation is often remarkable. A person who struggled with hearing loss for years suddenly hears normally again. Phone conversations become effortless. Movies and music are enjoyable. Work and social interactions improve.

The surgery isn’t perfect, some risks exist, and a small percentage of patients don’t achieve ideal results. But for the vast majority, stapedectomy is life-changing in the most positive way.

Here at Prime ENT Center in Hardoi, while I don’t perform stapedectomy myself in our facility, I screen for otosclerosis, diagnose it, counsel patients thoroughly, and provide referrals to experienced otologic surgeons at major centers. I also provide postoperative care and long-term follow-up.

If you have progressive hearing loss, especially if you’re a young woman with a family history of hearing problems, get evaluated. Otosclerosis is rare enough that many people haven’t heard of it, yet common enough that if you have it, diagnosis and treatment can restore your hearing and quality of life.

Internal Links & Further Reading

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• High Blood Pressure and Dizziness, What’s the Real Connection?
• Dizziness and Falls in the Elderly, Prevention Guide for Indian Families