Obliterative otosclerosis.

Area of Science:

• Otolaryngology
• Neurosurgery
• Ophthalmology

Background:

• Otosclerosis is a common cause of conductive hearing loss.
• Obliterative otosclerosis presents unique surgical challenges.
• The drill-out technique offers a potential solution for these challenges.

Purpose of the Study:

• To evaluate the safety and efficacy of the drill-out technique for obliterative otosclerosis.
• To compare stapedectomy and stapedotomy outcomes in these cases.
• To assess hearing improvement and potential complications.

Main Methods:

• A retrospective review of 293 primary stapedectomies for otosclerosis.
• Identification of 14 cases (4.7%) with obliterative otosclerosis.
• Application of the drill-out technique for stapedectomy or stapedotomy.
• Analysis of audiological outcomes, including air-bone gap closure and hearing thresholds.

Main Results:

• The drill-out technique was employed in all 14 cases of obliterative otosclerosis.
• 50% of patients had bilateral obliterative disease.
• Significant air-bone gap closure was achieved in 100% of patients with measurable hearing loss.
• 62.5% achieved closure within 10 dB, and 37.5% within 10-20 dB.
• No deterioration in air-conduction thresholds at 8 kHz was observed.
• A mild sensorineural hearing loss at 4 kHz occurred in 25% of cases.
• No statistical difference in outcomes between stapedectomy and stapedotomy.

Conclusions:

• The drill-out technique is a safe and effective procedure for managing obliterative otosclerosis.
• This technique facilitates hearing improvement in patients with this challenging condition.
• Outcomes are comparable between stapedectomy and stapedotomy when using the drill-out method.