Background: Attic cholesteatomas can be exenterated by transcanal endoscopic ear surgery (TEES). In the limited operative field of exclusive transcanal endoscopic atticotomy, surgeons use either a piezosurgery scalpel or a drilling system to remove the posterior lateral bony wall of the epitympanum. We aimed to investigate the feasibility of using piezosurgery or microdrill for endoscopic atticotomy during exenteration of attic cholesteatomas.
Methods: This study is a retrospective chart review of patients diagnosed with attic cholesteatoma, who were treated by exclusive TEES. The superior and posterior external auditory canal bones were excised using a piezosurgery scalpel or microdrill. Preoperative and postoperative hearing thresholds were measured by pure-tone audiometry.
Results: The postoperative follow-up duration varied from 6 to 37 months. There were no significant differences in age, sex, laterality of the affected ear, and preoperative bone conduction thresholds between the piezosurgery scalpel and microdrill groups. The operative duration was longer in the piezosurgery group than in the microdrill group (135.6 ± 19.5 minutes vs 117.3 ± 29.1 minutes, p = 0.042). Seven of 30 (23.3%) patients in the microdrill group, but none in the piezosurgery group, had a friction injury from the drilling. Postoperative testing at higher frequencies of 2000, 3000, and 4000 Hz showed no deterioration in the bone conduction threshold in the piezosurgery group.
Conclusion: Endoscopic atticotomy performed using a piezosurgery scalpel is potentially safer but slower than using a microdrill for exenteration of attic cholesteatomas.
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