Otosclerosis in South Africa: Symptoms, Causes & Treatment | aihealz
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Otosclerosis.Care & specialists in South Africa
In South Africa, otosclerosis is managed by ents. Otosclerosis is a disease of abnormal bone remodelling localized to the otic capsule of the temporal bone that produces progressive conductive hearing loss when it fixes the stapes footplate in the oval window. It affects roughly 0.3-0.5% of adults clinically, with histological evidence at autopsy in approximately 10% of Caucasian adults — most never become symptomatic.
Otosclerosis (ICD-10: H80) is a primary disease of bone unique to the otic capsule, in which normal endochondral bone is replaced first by spongy vascular bone (otospongiosis, the active phase) and later by dense sclerotic bone (otosclerosis, the inactive phase). The most common focus is the fissula ante fenestram just anterior to the oval window: as new bone deposits around the stapes footplate, the stapes becomes progressively fixed, impairing transmission of vibration from tympanic membrane to inner ear and producing a conductive hearing loss (fenestral otosclerosis, around 90% of cases). When otosclerotic foci extend into or around the cochlea (retrofenestral or cochlear otosclerosis), they cause sensorineural hearing loss either as a pure phenotype or, more commonly, as a mixed sensorineural-conductive loss superimposed on stapes fixation. Histology shows pleomorphic osteoclasts, vascular spaces, and disorganized woven bone in active foci.
key facts
Prevalence
Clinically symptomatic in roughly 0.3-0.5% of Caucasian adults; histological evidence at autopsy approximately 10%
Demographics
Female-to-male ratio approximately 2:1; predominantly Caucasian, much less common in Asian and African populations
Avg. age
Typical age of onset 20-50; mean age at surgery roughly 40-45
Global cases
Bilateral in 70-80%; positive family history in 50-60% of cases
Specialist
ENT
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How you might notice it
The key symptoms of Otosclerosis are: Gradual, painless, progressive hearing loss usually noticed first in noisy environments and during telephone conversations, often beginning in the second to fifth decades., Bilateral but asymmetric hearing loss with the worse ear typically diagnosed first; bilateral disease eventually develops in 70-80% of patients., Paradoxically improved hearing in noisy environments (paracusis Willisii) — patients lip-read effectively despite background noise that overwhelms others., Low-pitched, persistent tinnitus in 65-75% of patients, often described as buzzing, humming, or roaring, sometimes pulsatile in the active otospongiosis phase., Mild dizziness or imbalance in roughly 25% of patients; severe vestibular symptoms are uncommon and suggest alternative diagnosis (Meniere disease, vestibular schwannoma)., Hearing loss noticeably worsening or first becoming apparent during pregnancy or after starting oral estrogen therapy in some patients., A reddish pink hue visible through an intact tympanic membrane on otoscopy — Schwartze sign — indicating vascular activity in the otospongiotic phase. Present in only 10% and not specific..
01Gradual, painless, progressive hearing loss usually noticed first in noisy environments and during telephone conversations, often beginning in the second to fifth decades.
02Bilateral but asymmetric hearing loss with the worse ear typically diagnosed first; bilateral disease eventually develops in 70-80% of patients.
03Paradoxically improved hearing in noisy environments (paracusis Willisii) — patients lip-read effectively despite background noise that overwhelms others.
04
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How it’s diagnosed
diagnosis
Diagnosis is made clinically by combining a typical history with otoscopy, tuning-fork tests, and pure-tone audiometry. On otoscopy the tympanic membrane is usually normal; the Schwartze sign (reddish-pink promontory visible through the membrane) is seen in only 10% of cases and reflects active otospongiosis. Weber test lateralizes to the worse-hearing ear and the Rinne test is negative (bone conduction louder than air conduction) in the affected ear. Pure-tone audiometry typically shows a conductive hearing loss greater at low frequencies, with a Carhart notch — a 5-15 dB depression of bone conduction at 2 kHz that resolves after successful stapes surgery. Bone conduction may also show high-frequency loss as cochlear involvement progresses. Tympanometry typically shows a Type As (low-compliance) curve, and acoustic stapedial reflexes are absent in advanced disease (or biphasic 'on-off' pattern in early stages). Speech discrimination is preserved out of proportion to pure-tone loss until significant cochlear involvement develops. High-resolution CT of the temporal bone is not essential for typical cases but is performed when surgery is planned to assess footplate thickness, exclude congenital anomalies (such as enlarged vestibular aqueduct or dehiscent superior semicircular canal), and identify cochlear otosclerosis. CT shows characteristic radiolucent foci anterior to the oval window in fenestral disease and 'fourth turn' or 'double ring' patterns in cochlear disease. MRI plays no role in routine diagnosis. The differential diagnosis includes superior semicircular canal dehiscence, ossicular chain discontinuity (often post-traumatic), tympanosclerosis, glomus tumor, congenital footplate fixation, Paget disease, and osteogenesis imperfecta.
Key tests
01
Pure-tone audiometry with bone and air conductionConfirms conductive (or mixed) hearing loss and identifies the characteristic Carhart notch at 2 kHz
02
Tympanometry and acoustic reflex testingConfirms reduced ossicular compliance (Type As tympanogram) and absent or biphasic stapedial reflexes
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Treatment & cost
medical treatments
✓Hearing aids (behind-the-ear, in-the-ear, or bone-conduction)
Stapedotomy (small-fenestra) with piston prosthesisClosure of air-bone gap to within 10 dB in 85-95% of operated ears at experienced centres; persistent gap in 5-10%; severe sensorineural loss in 1-2%
Stapedectomy (total or partial)Air-bone gap closure 80-90% in experienced hands; slightly higher rate of vertigo and SNHL than small-fenestra stapedotomy
Cochlear implantation for far-advanced otosclerosisOpen-set sentence recognition in over 80% of recipients at 12 months; comparable to other adult cochlear implant indications
Revision stapes surgeryAir-bone gap closure 60-80%; higher risk of sensorineural loss
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Causes & risk factors
known causes
Genetic predisposition with autosomal-dominant inheritance and reduced penetrance
Family history is present in 50-60% of cases. Linkage studies have mapped at least ten otosclerosis loci (OTSC1-OTSC10) with autosomal-dominant inheritance and roughly 40% penetrance. Genome-wide association studies have implicated common variants in COL1A1, BMP, and TGFB1 pathways. Most patients with otosclerosis have a polygenic susceptibility plus environmental triggers.
Hormonal factors and pregnancy
Otosclerosis affects women twice as often as men. Many patients first notice symptoms during pregnancy or after starting oral estrogen, and a smaller subset describe accelerated progression with subsequent pregnancies. Mechanism is thought to involve bone remodelling modulation by estrogen and progesterone.
Viral triggers (proposed)
Measles RNA has been detected in otosclerotic foci in some studies, and measles vaccination at the population level has been associated with declining otosclerosis incidence in Europe. The causal link remains debated; alternative explanations include cohort and ascertainment effects.
Disordered bone-remodelling biology localized to the otic capsule
Active foci show pleomorphic osteoclasts, vascular spaces, and woven bone replacing normal endochondral bone of the otic capsule. The same individuals do not have generalized bone disease, indicating organ-specific dysregulation rather than systemic osteopathy.
Connective tissue disorders (rare)
Conductive hearing loss resembling otosclerosis is part of osteogenesis imperfecta (van der Hoeve syndrome) and occasional reports in Paget disease and ankylosing spondylitis. These rare cases share features of disordered bone remodelling but differ in systemic involvement.
risk factors
Caucasian ethnicity
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Living with it
01There is no proven way to prevent otosclerosis; routine measles vaccination may reduce population incidence based on observational evidence.
02Maintain regular audiometric review (every 6-12 months) once hearing loss is detected to time interventions optimally.
03Be aware of family history and seek audiology assessment early if hearing changes appear.
04Counselling about pregnancy-related progression for women planning pregnancy.
05Treat coexisting middle-ear infection promptly to limit confounding hearing loss.
06Avoid uncontrolled high-noise exposure that can add sensorineural loss to existing conductive loss.
recommended foods
•Balanced diet adequate in calcium and vitamin D to support general bone health
•Adequate protein for bone remodelling support
•Magnesium- and antioxidant-rich foods (leafy greens, nuts) — observational links with noise-induced hearing loss prevention
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When to seek help
why see an ent
Diagnosis and management of otosclerosis are the province of ENT (otology). An otologist confirms the diagnosis through audiometry and imaging, offers hearing aids or surgery, and monitors progression over years. Surgery should be performed by an experienced otologist with documented outcomes in stapes microsurgery.
Fenestral (stapedial) otosclerosisApproximately 90% of cases. Otosclerotic foci anterior to the oval window fix the stapes footplate. Produces progressive conductive hearing loss with normal bone conduction (or a Carhart notch at 2 kHz). The classic surgical target.
Cochlear (retrofenestral) otosclerosisOtosclerotic foci extend into the cochlear endosteum, producing sensorineural hearing loss without stapes fixation. Less common; identified on CT temporal bone as 'fourth turn' lucencies or characteristic 'double ring' enhancement.
Mixed otosclerosisCombination of stapedial fixation and cochlear involvement, producing mixed conductive and sensorineural hearing loss. The most common clinical pattern at presentation in later disease.
Far-advanced otosclerosisSevere-to-profound sensorineural hearing loss with no measurable air-conduction thresholds; often follows long-standing untreated otosclerosis or rapid progression in pregnancy. May benefit from cochlear implantation.
Histologic (subclinical) otosclerosisOtosclerotic foci identified at autopsy in patients with no clinical hearing loss. Found in approximately 10% of Caucasian adults; underscores that not all foci produce symptoms.
Living with Otosclerosis
Timeline
After stapedotomy: hospital discharge same day or next day. First hearing improvement noted within 1-2 weeks once tampon and packing dissolve. Audiometric assessment at 4-6 weeks and 3-6 months. Full return to noisy/active occupations within 4-6 weeks. Second-side surgery considered after 6-12 months of stable hearing in the first ear. Cochlear implant activation 2-4 weeks postoperatively with audiological tuning over the following 6-12 months.
Lifestyle
01Use hearing aids consistently when prescribed; intermittent use limits adaptation and benefit.
02Inform colleagues, family, and friends about hearing difficulty to reduce frustration in conversation.
03Use looped induction systems and captioning in public venues when available.
04Use telephone amplifiers, captioned phones, and assistive listening devices for work and home.
05Avoid recreational scuba diving for at least 6 weeks after stapes surgery; lifetime restrictions are individualized.
06Avoid sudden pressure changes (forceful nose-blowing, sudden altitude change) early after stapes surgery.
Daily management
01Wear hearing aids consistently during waking hours and clean them daily.
02
Complementary approaches
Bone-anchored hearing aid (BAHA, Ponto, Bonebridge)Bone-conduction hearing aid surgically anchored to the skull; useful in mixed loss when stapes surgery is declined or contraindicated and conventional hearing aids are inadequate.
Active middle-ear implants (Vibrant Soundbridge)Implantable transducer attached to the long process of the incus or round window; alternative to stapes surgery in selected patients.
Choosing a doctor
Choose a fellowship-trained otologist or neurotologist who performs at least 20 stapes operations per year and reports outcomes (air-bone gap closure, sensorineural loss rate, taste disturbance). Avoid surgeons who cannot share recent audiometric outcome data.
Otosclerosis is a disease of abnormal bone remodelling localized to the otic capsule of the temporal bone. The most common form fixes the stapes — the smallest bone in the body — preventing it from transmitting vibration to the inner ear, producing progressive painless conductive hearing loss in young to middle-aged adults.
What are the first symptoms of otosclerosis?▾▴
The earliest symptoms are gradual painless hearing loss, often noticed first in noisy environments, on the telephone, or with women's and children's voices. Tinnitus develops in 65-75% of patients. Some report better hearing in noisy environments (paracusis Willisii) and a quiet speaking voice.
Is otosclerosis curable?▾▴
Otosclerosis cannot be cured medically, but the hearing loss it causes can be very effectively treated. Stapedotomy closes the air-bone gap to within 10 dB in 85-95% of operated ears. Hearing aids are an excellent non-surgical option. Cochlear implants can restore hearing in far-advanced sensorineural cases.
What causes otosclerosis?▾▴
Otosclerosis is a multifactorial disease driven by genetic predisposition (50-60% have family history; autosomal dominant inheritance with reduced penetrance), hormonal factors (women affected twice as often as men, pregnancy can accelerate), and possibly viral triggers (measles RNA detected in some foci). The result is disordered bone remodelling around the stapes footplate.
Is stapedotomy safe?▾▴
Stapedotomy is a well-established microsurgical procedure with excellent safety in experienced hands. Air-bone gap closure within 10 dB occurs in 85-95% of operated ears. Severe sensorineural complications (including dead ear) occur in 1-2%, with taste disturbance, vertigo, and persistent tinnitus less common. Choose an experienced otologist with documented outcomes.
Should I have hearing aids or surgery for otosclerosis?▾▴
Both are effective. Hearing aids are non-invasive, reversible, and excellent for mild-to-moderate hearing loss. Stapedotomy can produce more natural hearing without ongoing equipment but carries a small risk of sensorineural loss. Choice depends on age, occupation, severity, and personal preference. Many patients trial hearing aids first.
Does otosclerosis run in families?▾▴
Yes. Roughly 50-60% of patients with otosclerosis report a first-degree relative with similar hearing loss. Inheritance is typically autosomal dominant with reduced penetrance (around 40%). Genetic testing is not routine but may be considered in atypical families with very early onset or syndromic features.
Why does otosclerosis affect women more?▾▴
Women are affected approximately twice as often as men. Hormonal modulation of bone remodelling — particularly during pregnancy and with exogenous estrogen — is thought to explain part of the female predominance. Many women first notice or experience accelerated hearing loss during pregnancy.
Does pregnancy make otosclerosis worse?▾▴
Pregnancy can unmask or accelerate otosclerosis in roughly 30-40% of affected women. Some experience worsening hearing during each pregnancy. Effective surgery is available before, between, or after pregnancies; hormonal triggers can be discussed with both the otologist and obstetrician.
Can otosclerosis cause deafness?▾▴
Untreated otosclerosis rarely causes total deafness from the conductive component alone, but cochlear (sensorineural) progression in far-advanced disease can lead to profound hearing loss. Stapes surgery treats the conductive part; cochlear implantation is highly effective for far-advanced sensorineural loss.
Is otosclerosis painful?▾▴
No, otosclerosis is typically painless. Hearing loss develops gradually over years. Pain, otorrhea, or fever should prompt evaluation for alternative diagnoses such as middle-ear infection or cholesteatoma.
How is otosclerosis diagnosed?▾▴
Diagnosis combines history, otoscopy (often normal), tuning-fork tests, and pure-tone audiometry showing characteristic conductive hearing loss with a Carhart notch at 2 kHz. Tympanometry shows a low-compliance (Type As) curve and absent stapedial reflexes. CT of the temporal bone is used before surgery to assess footplate and exclude congenital anomalies.
What is the Carhart notch?▾▴
The Carhart notch is a characteristic 5-15 dB depression in bone-conduction thresholds at 2 kHz seen in stapedial otosclerosis. It reflects altered cochlear mechanics due to stapes fixation and disappears after successful stapes surgery. It is a useful but not pathognomonic audiometric feature.
What happens during stapes surgery?▾▴
Under microscope and local or general anesthesia, the surgeon lifts the eardrum, removes the stapes superstructure, makes a small fenestration in the stapes footplate, and places a piston prosthesis (Teflon, titanium, or platinum-wire) coupled to the incus. Day-case procedure of 30-60 minutes; hospital stay is usually under 24 hours.
How long does recovery from stapes surgery take?▾▴
Patients typically go home the same day or the following morning. Hearing improvement is usually noticed within 1-2 weeks once packing dissolves. Return to office work is within 1-2 weeks, and to active work or noisy environments within 4-6 weeks. Avoid scuba diving and high-impact activity for 4-6 weeks.
Can otosclerosis come back after surgery?▾▴
Recurrence of the conductive component after successful stapes surgery is uncommon but possible — prosthesis displacement, incus erosion, or new bone growth around the prosthesis can produce recurrent hearing loss decades later and may require revision surgery. Cochlear progression continues independently of surgery and justifies ongoing audiometric follow-up.
Are both ears usually affected?▾▴
Yes, bilateral involvement develops in 70-80% of patients, although the two ears are often affected asymmetrically. Surgery is typically offered first on the worse-hearing ear; the second ear is operated after stable hearing is demonstrated in the first, usually 6-12 months later.
Does noise exposure cause otosclerosis?▾▴
Noise exposure does not cause otosclerosis, which is a primary bone disease. However, noise-induced sensorineural hearing loss can coexist and worsen the overall hearing. Hearing protection is recommended for otosclerosis patients in noisy environments.
Is sodium fluoride effective for cochlear otosclerosis?▾▴
Sodium fluoride has been used for cochlear otosclerosis on the rationale of stabilizing active otospongiotic foci, but high-quality evidence is lacking. Observational studies suggest slower progression in some patients; side-effects include gastrointestinal upset and rarely fluorosis. Discuss benefits and risks with the otologist.
What is the success rate of stapes surgery?▾▴
In experienced hands, closure of the air-bone gap to within 10 dB is achieved in 85-95% of operated ears, with overall subjective improvement in over 90%. Severe sensorineural complications occur in 1-2%. Outcomes depend strongly on surgeon experience, so seek a specialist who reports their personal results.
Can children get otosclerosis?▾▴
Pediatric otosclerosis is rare but does occur, especially in families with strong inheritance. Audiometric criteria for surgery in children are similar to adults but the threshold to operate is often higher because of continued bone growth and uncertainty about long-term prosthesis behaviour.
Low-pitched, persistent tinnitus in 65-75% of patients, often described as buzzing, humming, or roaring, sometimes pulsatile in the active otospongiosis phase.
05Mild dizziness or imbalance in roughly 25% of patients; severe vestibular symptoms are uncommon and suggest alternative diagnosis (Meniere disease, vestibular schwannoma).
06Hearing loss noticeably worsening or first becoming apparent during pregnancy or after starting oral estrogen therapy in some patients.
07A reddish pink hue visible through an intact tympanic membrane on otoscopy — Schwartze sign — indicating vascular activity in the otospongiotic phase. Present in only 10% and not specific.
08Difficulty hearing soft-spoken speech, women's and children's voices, and high-frequency consonants once high-frequency loss is established.
09Progressive social withdrawal, frustration, and depression in untreated long-standing disease — common but often unspoken at consultations.
10Quiet speaking voice — patients perceive their own voice as louder than others' because of conductive hearing loss (paracusis loci).
early warning signs
•Subtle bilateral hearing difficulty in a woman aged 20-40 with a family history of similar problems
•New tinnitus that is constant, low-pitched, and bilateral
•Hearing loss noticed during pregnancy or shortly after delivery
•Difficulty hearing the doorbell or alarm clock without other obvious cause
•Better hearing in noisy than quiet environments (paracusis Willisii)
● emergency signs
•Sudden hearing loss within hours to days — exclude sudden sensorineural hearing loss requiring urgent steroid therapy
•Severe vertigo with hearing loss — exclude Meniere disease, vestibular schwannoma, or labyrinthitis
•Facial weakness, otorrhea, or severe ear pain — exclude middle-ear infection, cholesteatoma, or rare facial nerve involvement
•Postoperative sudden severe hearing loss or vertigo after stapes surgery — perilymph fistula or reparative granuloma requires urgent re-exploration
•Severe headache, papilloedema, or visual disturbance in a patient with otosclerosis — exclude unrelated intracranial pathology
03
Tuning-fork tests (Weber, Rinne)Bedside confirmation of conductive vs sensorineural loss and lateralization
04
Otoscopy and pneumatic otoscopyExcludes middle-ear effusion, tympanic membrane perforation, cholesteatoma, and middle-ear masses; rarely shows Schwartze sign
05
Speech audiometryQuantifies word discrimination; typically well preserved in conductive otosclerosis until cochlear involvement
06
High-resolution CT temporal boneMaps otosclerotic foci, evaluates footplate thickness, identifies cochlear otosclerosis, and excludes congenital ossicular anomalies before surgery
Outlook
Outcome is generally excellent with current treatment. Pure-tone audiometric outcomes after small-fenestra stapedotomy in experienced hands close the air-bone gap to within 10 dB in 85-95% of operated ears, with substantial subjective improvement in over 90% of patients. Serious sensorineural complications (including dead ear) occur in approximately 1-2% of operations; persistent dizziness, taste disturbance, and tinnitus are reported less commonly. The second ear may be operated after stable hearing is demonstrated in the first ear, typically 6-12 months later. Without surgery, otosclerosis progresses slowly over decades; hearing aids continue to deliver good benefit in most. Cochlear involvement progresses independently of stapes surgery and may continue after successful stapedotomy, justifying ongoing audiometric follow-up. Far-advanced disease with profound sensorineural hearing loss responds well to cochlear implantation. Pregnancy and exogenous estrogen can transiently accelerate progression but do not abrogate the benefit of subsequent surgery. Quality-of-life scores improve substantially after both hearing aid fitting and surgery; depression and social withdrawal often resolve. Recurrence (refixation of the prosthesis, erosion of the incus, or growth of new otosclerotic bone) is uncommon but possible decades later and may require revision surgery.
non-modifiable
Highest clinical and histological prevalence in Caucasian populations; substantially lower in African, Native American, and Asian populations.
Female sexnon-modifiable
Female-to-male ratio approximately 2:1 in surgical and clinical series, partly reflecting hormonal acceleration during pregnancy.
Family history of otosclerosis or early adult hearing lossgenetic
Roughly half of affected individuals report a first-degree relative with similar hearing pattern; family history is the strongest single risk marker.
Age 20-50non-modifiable
Peak presentation in third and fourth decades; rare under 15 and uncommon over 60 except for far-advanced presentation.
Pregnancy and exogenous estrogen exposuremodifiable
Hormonal changes can unmask or accelerate otosclerosis; about 30-40% of women describe worsening during pregnancy. Pre-pregnancy counselling and audiometric monitoring help anticipate care.
Family history of osteogenesis imperfecta or connective tissue disordergenetic
Rare syndromic causes of stapedial fixation should be considered in patients with blue sclerae, bone fragility, or family history of OI.
•Mediterranean-style dietary pattern for overall cardiovascular and metabolic health
foods to avoid
•Excess alcohol around the time of surgery — bleeding risk and balance impact
•Caffeine immediately after stapes surgery — may worsen dizziness
•High-fluoride supplements without medical advice if considering sodium fluoride therapy
•Smoking — accelerates progressive sensorineural hearing loss generally
08Cochlear progression after successful stapes surgery, requiring ongoing audiometric review.
choosing the right hospital
01Comprehensive audiology service with experienced staff
02Operating microscope, otologic instruments, and stapes laser (KTP, CO2, or argon)
03Experienced otologist performing high-volume stapes surgery
04Vestibular rehabilitation and cochlear implant team for advanced cases
05Outpatient follow-up audiometry available at 4-6 weeks and 6 months
Essential facilities
Tertiary otology and neurotology centresDesignated cochlear implant programmesGenetic counselling services for familial casesAudiology clinics offering hearing-aid trialsVestibular rehabilitation services
Track hearing function and report new tinnitus or dizziness promptly.
03Avoid loud noise exposure or use ear protection in occupational settings.
04Take prescribed medications (sodium fluoride if used) with food and follow renal monitoring.
05Schedule follow-up audiometry every 6-12 months.
06Carry hearing-loss alert if cochlear implant or stapes prosthesis in situ for emergency identification.
Exercise
Regular moderate aerobic exercise is encouraged for general health. After stapes surgery, avoid heavy lifting, straining, and pressure-changing sports (scuba diving, free diving, parachute jumping) for at least 4-6 weeks; gradual return to high-impact exercise from 6-8 weeks. Long-term restrictions are individualized by the operating otologist.