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Two cases of conductive hearing loss due to ossification of the stapedius tendon are described. A woman, 24 years old, suffered from progressive, bilateral (R>L) hearing loss from the age of sixteen and was referred to our office for advice regarding surgical treatment. The tympanic membrane, tympanogram and radiological examinations were normal on both sides, however, the pure tone audiogram (PTA) showed bilateral conductive hearing loss and the stapedial reflex had disappeared on both sides. A diagnosis of otosclerosis was made, and the patient was hospitalized for a stapedectomy. During surgery, the stapes on the right side was revealed to be immobile with fixation of the footplate as well as ossification of the stapedius tendon. A stapedectomy, combined with removal of the ossified stapedius tendon, was performed, and the PTA threshold improved to 21.3dB from 47.5dB. A man, 18 years old, was noticed to have bilateral conductive hearing loss at the age of six. A diagnosis of ossicular chain anomaly was made, and the patient subsequently underwent a hearing examination every year. The patient decided to undergo an exploratory tympanotomy at the age of seventeen. During surgery, the stapes on both sides was revealed to be fixed and showed no movability due to ossification of the stapedius tendon, fixation of the f ootplate, and an extra bony connection between the anterior crus of the stapes and the facial nerve canal. A stapedectomy combined with removal of two bony connections restored his hearing level to 15dB from 48.8dB on the right side and to 17.5dB from 33.8dB on the left side.

Two Cases of Conductive Hearing Loss due to Ossification of the Stapedius Tendon.