Relationship Between Postoperative Aeration Around the Stapes and Postoperative Hearing Outcome After Canal Wall Down Tympanoplasty With Canal Reconstruction for Cholesteatoma

Abstract

To evaluate the correlation between postoperative aeration around the stapes and hearing outcome after canal wall down tympanoplasty with canal reconstruction for cholesteatoma. Retrospective case review. University hospital otolaryngology department. Seventy ears of 65 patients with middle ear cholesteatoma were included. Patients who had fixed or poorly mobile ossicular chain was excluded. They were underwent canal wall down tympanoplasty with canal reconstruction. Canal wall was reconstructed with the tragal or conchal cartilage and the cortical bone plate. We measured aeration around the stapes on coronal and axial computed tomographic sections at 1 year after ossiculoplasty and investigated the correlation between postoperative aeration around the stapes and postoperative air-bone gap (using the mean of 0.5-, 1-, and 2-kHz threshold values) at 1 year after ossiculoplasty. We also investigated it for each of Wullstein type and for each of 0.25-, 0.5-, 1-, 2-, and 4-kHz thresholds. Aeration around the stapes was negatively correlated with postoperative air-bone gap (correlation coefficient, -0.53; p < 0.05). Types I and IV tympanoplasty had a higher correlation with postoperative air-bone gap than type III tympanoplasty. The 0.5-KHz frequency had a higher correlation with postoperative air bone gap than other frequencies. Measurement of postoperative aeration around the stapes is an effective method for evaluating the importance of middle ear aeration. Aeration around the stapes contributes to better hearing outcome.