A BAHA (bone-anchored hearing aid) functions on the principle of:

• A Air conduction amplification via the tympanic membrane
• B Electrical stimulation of the cochlear hair cells
• C Electromagnetic induction through the round window
• D Direct osseous conduction bypassing the outer and middle ear ✓

Explanation

BAHA (bone-anchored hearing aid) transmits sound vibrations directly through the skull bone (osseointegrated titanium implant behind the ear) to the cochlea, bypassing the outer and middle ear entirely. This makes it ideal for conductive hearing loss, mixed hearing loss, and single-sided deafness. It differs fundamentally from cochlear implants, which electrically stimulate spiral ganglion neurons.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.