Gap between UAS and ureteroscope predicts renal stone-free rate after flexible ureteroscopy with the fragmentation techn
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ORIGINAL ARTICLE
Gap between UAS and ureteroscope predicts renal stone‑free rate after flexible ureteroscopy with the fragmentation technique Mitsuru Komeya1,2 · Hisakazu Odaka3 · Takahiko Watanabe3 · Hirokazu Kiuchi3 · Takehiko Ogawa1 · Masahiro Yao1 · Junichi Matsuzaki3 Received: 8 May 2020 / Accepted: 10 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose To assess the effect of our new classification on surgical outcomes after flexible ureteroscopy (fURS) for kidney stones. Methods We retrospectively examined 128 patients after single renal fURS procedures performed using ureteral access sheaths (UASs) with the fragmentation technique. Based on the gap (calculated by subtracting the ureteroscope diameter from the UAS diameter), enrolled patients were divided into three groups: small (
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