Introduction and Objectives: To assess factors affecting Fluoroscopy Time (FT) during PCNL. The easy-to-use scoring system obtained from CT imaging may be utilized in preoperative patient counseling, surgical planning, quality assessment, and as a standardized measure to evaluate outcomes across different series. nephrolithometry accurately predicted stone-free rate following PCNL.

CONCLUSIONS: In a multicenter study including data from multiple surgeons, S.T.O.N.E.

On average, compared to scores 5–7, scores 8– 10 and 11–13 have a decrease in the odds of being stone free by 71% and 85%, respectively. In risk stratification, low-risk patients with 5–7 scores had 22.8% of residual stones, compared to medium-risk (8–10) and high-risk patients (11–13) who had 50.8% and 66.7% of residual stones, respectively (p = 0.001). On average, for each increase in one unit of S.T.O.N.E score, odds of being stone-free decreased by 32%. scores than patients with residual stones (7.7 vs. Stone-free patients had statistically significant lower S.T.O.N.E. score was significantly associated with postoperative stone-free status (P < 0.001). In logistic regression analysis, S.T.O.N.E. Overall single procedure stone-free rate was 69%. Mean overall nephrolithometry score was 8.2 (SD = 2.2). RESULTS: In total, 706 met inclusion criteria and were included in the analysis. score with patient demographics, stone characteristics, and surgical outcomes was analyzed. Preoperative CT images were reviewed and S.T.O.N.E. METHODS: We performed a multicenter retrospective study of patients undergoing PCNL. We assessed the ability of nephrolithometry score to predict stone-free status in a multicenter database of patients undergoing PCNL. nephrolithometry was previously developed to quantitate stone complexity. INTRODUCTION AND OBJECTIVES: The S.T.O.N.E.

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