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29.03.2021 | Original Article

Evaluation of a free 3D software for kidney stones’ surgical planning: “kidney stone calculator” a pilot study

verfasst von: Frédéric Panthier, Olivier Traxer, Laurent Yonneau, Thierry Lebret, Laurent Berthe, Lounès Illoul, Marc-Olivier Timsit, Arnaud Mejean, Steeve Doizi, François Audenet

Erschienen in: World Journal of Urology | Ausgabe 9/2021

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Abstract

Introduction

Kidney Stone Calculator (KSC) is a free, three-dimensional (3D) planning software for flexible ureteroscopy(fURS) with Holmium:YAG(Ho:YAG) endocorporeal lithotripsy (EL). KSC provides the stone volume (SV) and expected duration of lithotripsy (ExDL) estimations based on non-enhanced-CT scan (NECT) DICOM series. We aimed to provide a preclinical and clinical evaluation of KSC.

Patients and methods

A preclinical evaluation measured the SV by three operators (resident, endourology expert and research engineer) among 17 NECT cases. Between January and March 2020, a multicentric, prospective, observational double-blind clinical evaluation was conducted in patients presenting with renal stones treated with Ho:YAG-EL during fURS and preoperative NECT. Demographic and surgical data were collected. The primary endpoint was a significant median difference between ExDL and EffectiveDL (EfDL). Second, efficiency (J/mm³) and efficacy (mm³/min) ratios were calculated.

Results

The preclinical evaluation showed no significant difference in the SV measurements among operators (p > 0.05). Pearson and Kendall coefficients of 0.99 and 0.98, respectively, were found. Twenty-six patients were included in the clinical evaluation, with a median age of 55 years. In 66% of cases, there was a single stone located in the lower pole, with a density > 1000 Hounsfield Unit observed in 42% and 85% of cases. A 14% [Q1–Q3 (5.4–24.8); p = 0.36] median difference between ExDL and EfDL was noted, which was greater in the case of lower pole stones with no possible relocation (p = 0.008). Median values of 17.6 J/mm³ and 0.4 (0.32–0.56) mm³/s EL were also noted.

Conclusions

Kidney Stone Calculator is a reproducible and accurate software that allows for an estimation of the stone burden and provides an ExDL for URSf. Defining the influencing factors of EL will improve its ExDL.

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Titel: Evaluation of a free 3D software for kidney stones’ surgical planning: “kidney stone calculator” a pilot study
verfasst von: Frédéric Panthier
Olivier Traxer
Laurent Yonneau
Thierry Lebret
Laurent Berthe
Lounès Illoul
Marc-Olivier Timsit
Arnaud Mejean
Steeve Doizi
François Audenet
Publikationsdatum: 29.03.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: World Journal of Urology / Ausgabe 9/2021
Print ISSN: 0724-4983
Elektronische ISSN: 1433-8726
DOI: https://doi.org/10.1007/s00345-021-03671-z

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Abstract

Introduction

Patients and methods

Results

Conclusions

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