Jadeja KRUSHNADEVSINH, Amit THOMBARE, Choudhary RAJEEV
Journal of Urological Surgery - 2026;13(2):102-107
Objective: To identify a better predictor of renal stone burden among stone volume and stone size, and their predictive efficacy on residual fragments post-retrograde intrarenal surgery (RIRS). Materials and Methods: This single-center prospective observational study was conducted from July 2023 to December 2024, involving patients undergoing RIRS for renal calculi. Pre-operative renal stone parameters were analyzed on non-contrast computed tomography (NCCT) kidney, ureter, and bladder (KUB) scan. The residual fragments were determined by NCCT-KUB, on the 90th postoperative day. The relationships between possible predictors and the residual fragments were analyzed using a logistic regression model. Results: According to multivariate analysis, the stone volume (p=0.038) was found to be the only significant independent predictor of residual fragments, while other factors such as stone size (p=0.627), age (p=0.251), location (p=0.506), and body mass index (p=0.69) did not have an impact on stone-free rates post RIRS. The area under curve generated cut-off was 889 mm3 for stone volume. Conclusion: Among the parameters of renal stone burden, the stone volume determined by NCCT-KUB was a statistically significant predictor of residual fragments, post-RIRS, compared to stone size.
