MPR-CT Imaging for Stapes Prosthesis: Accuracy and Clinical Significance

Objectives: The aims of this article are: 1) to re-evaluate the accuracy of multiple planar reconstruction computed tomography (MPR-CT) imaging on stapes-prosthesis parameters, and 2) to clarify possible relationships between prosthesis intravestibular depth and postoperative hearing outcomes. Patients: Seventy patients (46 women and 24 men; 32 right and 38 left sides) with the mean age of 40 years (range, 19–62 yr) with clinical otosclerosis. Intervention(s): All patients underwent stapedotomy and were implanted with the same type of titanium piston prosthesis by the same surgeon. Main Outcome Measure(s): Postoperative MPR-CTs were obtained at patients’ follow-up visits. The length and intravestibular depth of the stapes prosthesis (including absolute and relative depth) were calculated from the MPR-CT imaging. Relationships between the intravestibular depth of the prosthesis and hearing outcomes (pre- and postoperative audiograms) were analyzed using Spearman correlation analyses. Results: The length of the prosthesis was overestimated by 1.8% (0.1 mm) by the MPR-CT imaging. Axial and coronal measurements were significantly correlated (p 

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