Endoscopic transcanal stapedotomy: how I do it

Abstract

Current paper presents a surgical technique and preliminary results of the first eight consecutive fully endoscopic transcanal stapedotomies. All eight procedures were performed under local anesthesia by the same surgeon using rigid endoscopes of 3-mm diameter, 14-cm length, 0° and 30°. A posterior tympanomeatal flap was elevated transmeatally with the 0° endoscope and then transposed anteriorly. Stapes fixation was confirmed, the stapes tendon was cut with curved micro-scissors, and the stapes was separated from the incus in the incudo-stapedial joint. The anterior and posterior stapedial crus were carefully fractured, and the superstructure was removed. The hole in the foot-plate was created with a Skeeter microdrill using a 0.5-mm-diameter diamond burr. A platinum/fluoroplastic piston prosthesis (0.4-mm diameter) was placed into this hole and fitted along the long process of the incus. The tympano-meatal flap was repositioned, and the external auditory canal was filled with Gelfoam(®). The chorda tympani nerve was preserved in all cases. A 4.5-mm prosthesis was used in six cases and a 4.75-mm prosthesis in two. Pure tone audiograms demonstrated improved air- and bone-conduction threshold averages across the three speech frequencies (0.5-1.2 kHz) 6 months after surgery (64 vs. 29.8 dB and 30.6 vs. 25.1 dB, respectively). The average postoperative air-bone gap was within 10 dB in six ears and between 10 and 15 dB in the other two ears. Our preliminary results indicate that transcanal fully endoscopic stapedotomy is a feasible and safe technique for surgical management of hearing loss associated with otosclerosis.