Otosclerosis: Abnormal Bone Growth and Hearing Loss

Lovedeep Kholia
May 7, 2024
2 min read

Otosclerosis is a condition that affects the middle ear, leading to progressive hearing loss. Let’s explore what otosclerosis is, its causes, symptoms, and available treatment options.

What Is Otosclerosis?

Definition: Otosclerosis involves an abnormal overgrowth of bone within the middle ear.
Impact: This overgrowth prevents one of the tiny bones in the middle ear—the stapes—from vibrating as it should.
Consequence: When the stapes cannot vibrate properly, sound transmission to the inner ear is limited, resulting in hearing loss.

How Do We Hear?

Sound Waves: Sound waves enter the outer ear and travel through the ear canal to reach the eardrum.
Middle Ear Bones: These vibrations then pass to three tiny bones in the middle ear: the malleus (hammer), incus (anvil), and stapes (stirrup).
Cochlea: The middle ear bones amplify the sound vibrations and send them to the cochlea, a fluid-filled structure shaped like a snail in the inner ear.
Hair Cells: Inside the cochlea, hair cells detect the vibrations and convert them into electrical signals.
Auditory Nerve: The auditory nerve carries these signals to the brain, allowing us to perceive sound1.

https://www.youtube.com/watch?v=-bKy02f1pD4

Causes of Otosclerosis:

Stuck Stapes: Otosclerosis is most often caused when the stapes bone becomes stuck in place.
Result: When the stapes cannot vibrate, sound cannot travel through the ear, leading to hearing impairment.

https://www.youtube.com/watch?v=vo3GYc4YeHc

Risk Factors:

Family History: Some cases of otosclerosis are thought to be inherited.
Gender: White, middle-aged women are most at risk.
Pregnancy: Hormonal changes during pregnancy may contribute to otosclerosis 2.

Symptoms:

Hearing Loss: Gradual hearing loss, affecting both ears (though one ear may be worse than the other).
Dizziness: Some individuals with otosclerosis may experience dizziness.
Tinnitus: Ringing or buzzing in the ears 3.