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Updated: Feb 4, 2026
07:35
The Microscopic Transcanal Approach in Stapes Surgery Revisited
Published on: February 16, 2022
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Prediction of Appropriate Prosthesis Length Using Preoperative Computed Tomography in Stapes Surgery With Transcanal
Chiaki Nakahama1, Yasuyuki Kajimoto1, Yuki Koda1
1Otolaryngology, Osaka Metropolitan University, Osaka, JPN.
Cureus
|February 3, 2026
Summary
Preoperative CT scans can estimate prosthesis length for transcanal endoscopic ear surgery (TEES) stapes procedures. Accurate prosthesis length measurement using CT may improve hearing outcomes in TEES stapes surgery.
Area of Science:
- Otolaryngology
- Surgical Innovation
- Medical Imaging
Background:
- Transcanal endoscopic ear surgery (TEES) is a preferred method for stapes surgery.
- Accurate prosthesis length selection is crucial for successful stapes surgery outcomes.
- Preoperative imaging can aid in surgical planning for otologic procedures.
Purpose of the Study:
- To evaluate the efficacy of preoperative CT scans in estimating appropriate prosthesis length for TEES stapes surgery.
- To correlate estimated prosthesis length with postoperative hearing results.
- To identify factors influencing hearing outcomes in TEES stapes surgery.
Main Methods:
- Retrospective analysis of 31 patients undergoing TEES for stapes surgery.
- Measurement of the straight-line distance from incudostapedial joint to oval window on preoperative CT (eAPL).
- Comparison of eAPL with actual prosthesis length and postoperative hearing outcomes.
Main Results:
- Postoperative hearing was good in 87.1% of cases.
- Inadequate prosthesis length (shorter than eAPL) was noted in 3 of 4 cases with poor hearing outcomes.
- Postoperative CT revealed inadequate prosthesis positioning in other cases with poor outcomes.
Conclusions:
- Estimating prosthesis length via preoperative CT is a valuable tool for TEES stapes surgery.
- Accurate prosthesis length measurement can potentially enhance postoperative hearing results.
- CT-based length estimation may reduce the incidence of inadequate prosthesis placement.
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