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Agreement between HRCT Imaging and Intraoperative Measurements in Predicting Stapedotomy Prosthesis Length in
Mohamad Reza Afzalzadeh1, Farzaneh Khoroushi2, Abolfazl Zanjani Tabasi1
1Sinus and Surgical Endoscopic Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Iran.
Iranian Journal of Otorhinolaryngology
|August 12, 2025
Summary
High-resolution computed tomography (HRCT) accurately measures incus-to-footplate distance, predicting optimal prosthesis length for stapedotomy in otosclerosis patients. This imaging tool enhances surgical planning and patient outcomes.
Area of Science:
- Otolaryngology
- Medical Imaging
- Surgical Planning
Background:
- Otosclerosis necessitates stapedotomy, a procedure requiring precise prosthesis length selection.
- Accurate measurement of the incus-to-footplate distance is crucial for successful stapedotomy outcomes.
Purpose of the Study:
- To evaluate the accuracy of preoperative high-resolution computed tomography (HRCT) in measuring the incus-to-footplate distance.
- To assess HRCT's potential for predicting the optimal prosthesis length for stapedotomy in otosclerosis patients.
Main Methods:
- A cross-sectional study involving fifty patients undergoing primary stapedotomy.
- Preoperative HRCT scans were used to measure the incus-to-oval window distance.
- HRCT measurements were compared with intraoperative measurements using correlation and Bland-Altman analysis.
Main Results:
- Strong correlation (r=0.928, P<0.001) between HRCT and intraoperative measurements.
- Mean bias of 0.11±0.07mm with narrow limits of agreement (-0.02 to 0.26 mm).
- HRCT demonstrated reliable prediction of prosthesis length with a maximum error of 0.28mm.
Conclusions:
- Preoperative HRCT imaging is a valuable tool for accurate prediction of prosthesis length.
- HRCT enhances surgical planning for stapedotomy in otosclerosis.
- This imaging modality improves the precision of stapedotomy procedures.
