Analysis of the accuracy of high-resolution computed tomography techniques for the measurement of stapes prostheses

Abstract

CT measurement consistently overestimated intravestibular piston dimensions and vestibular intrusion. Modern temporal bone imaging systems are not yet able to depict the stapes piston position with a sufficient degree of accuracy.

Stapes Prosthesis Length: One Size Fits All?

“…The observation of a mean insertion depth of 0.74 mm indicates a result similar to other groups aiming for an insertion depth of 0.5 mm [Bozzato et al, 2010]. An explanation for the insertion depth of more than 0.5 mm might be a weight-related decrease of the incus-footplate distance or a mismeasurement.…”

“…1). Related to the known overestimation of prosthesis length [Vandevoorde et al, 2017;Bozzato et al, 2010], 0.1 mm was subtracted from the measured length for further calculations.…”

“…During a clinical routine, two ways to choose a stapes prosthesis length are common: (1) the individual measurement of prosthesis length by adding 0.5 mm to the long incus process-to-footplate distance and (2) the use of a standard length of stapes prostheses for all cases. Mutze Observations with radiological tools, such as cone beam computer tomography and flat-panel tomography, of higher visual resolution on the stapes piston position allow the estimation of insertion depth with a low longitudinal artefact of down to 0.1 mm [Zaoui et al, 2012;Bozzato et al, 2010;Vandevoorde et al, 2017;Fang et al, 2016].…”

Surgical and Clinical Confirmation of Temporal Bone CT Findings in Patients with Otosclerosis with Failed Stapes Surgery

“…10 Metallic stapes prostheses are more challenging to evaluate with CT because attenuation artifacts limit accurate evaluation of prosthesis size and intravestibular penetration. [11][12][13] Although most metallic prostheses were easy to evaluate in this study, a few were difficult to visualize, probably because of smaller prosthesis size and technical factors. It remains worthwhile commenting on suspected piston sizing abnormalities because most patients presenting with persistent CHL or other postoperative complications require surgical re-exploration, and preoperative CT findings improve surgical planning.…”

Visualisation of passive middle ear implants by cone beam and multi-detector computed tomography: a comparative in vitro study

“…In the last few years the usage of CBCT in head and neck radiology has intensified and CBCT has become a remarkable option and a possible alternative to multi-detector CT (MDCT) [9][10][11][12].…”