Merck Manual

Please confirm that you are a health care professional

honeypot link

Otosclerosis

By

Richard T. Miyamoto

, MD, MS, Indiana University School of Medicine

Last full review/revision Jun 2020| Content last modified Jun 2020
Click here for Patient Education

Otosclerosis is a disease of the bone of the otic capsule that causes an abnormal accumulation of new bone within the oval window.

In otosclerosis, the new bone traps and restricts the movement of the stapes, causing conductive hearing loss Worldwide, about half a billion people (almost 8% of the world's population) have hearing loss (1). More than 10% of people in the US have some degree of hearing loss that compromises their... read more . Otosclerosis also may cause a sensorineural hearing loss Hearing Loss Worldwide, about half a billion people (almost 8% of the world's population) have hearing loss (1). More than 10% of people in the US have some degree of hearing loss that compromises their... read more Hearing Loss , particularly when the foci of otosclerotic bone are adjacent to the scala media. Half of all cases are inherited. The measles virus plays an inciting role in patients with a genetic predisposition for otosclerosis.

Although about 10% of white adults have some otosclerosis (compared with 1% of African Americans and even less in blacks of primarily African origin), only about 10% of affected people develop conductive hearing loss. Hearing loss caused by otosclerosis rarely may manifest as early as age 7 or 8, but most cases do not become evident until the late adolescent or early adult years, when slowly progressive, asymmetric hearing loss is diagnosed.

A hearing aid may improve hearing. Alternatively, stapedectomy to remove some or all of the stapes and to replace it with a prosthesis may be beneficial, but the risks of hearing loss and impaired vestibular function need to be considered.

Click here for Patient Education
NOTE: This is the Professional Version. CONSUMERS: Click here for the Consumer Version
Professionals also read

Test your knowledge

Vocal Cord Paralysis
Vocal cord paralysis has several causes and can be bilateral or unilateral. Unilateral vocal cord paralysis is most common. Approximately one third of unilateral vocal cord paralyses are neoplastic, one third are traumatic, and one third are idiopathic. Of the idiopathic causes, which of the following is the most common? 
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID

Also of Interest

Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
TOP