Comparison of CROES, Guy's, S.T.O.N.E., and S-ReSC Nephrolithometric Scoring Systems in Predicting Success and Complications in Patients Undergoing Supine Mini Percutaneous Nephrolithotomy

Abstract In addition to the fact that the significance of the nephrolitometric scoring systems (NSSs) remains unclear, no study has been conducted to assess the effectiveness of these scoring systems in percutaneous nephrolithotomy (PNL) performed in the supine position. We aimed to compare the CROES, Guy's scoring system (GSS), S.T.O.N.E., and S-ReSC NSSs for success and complications in patients undergoing supine mini-PNL (m-PNL). The prospectively recorded data of the patients who underwent supine m-PNL was reviewed retrospectively, and a total of 112 patients were included in the study. Demographic, operation, post-procedure data, and CROES, GSS, S.T.O.N.E., and S-ReSC scores were assessed and compared between the stone-free (SF) and residuel groups. There were significant differences between the SF and residual groups in terms of mean CROES, S.T.O.N.E., and S-ReSC scores (p = 0.003, p = 0.009, and p = 0.015, respectively). Similarly, there were significant differences between the grades of these scoring systems and the success of the procedure (p = 0.035, p = 0.007, and p = 0.007, respectively). However, the GSS was insignificant. The area under curve values in ROC analysis of CROES, S.T.O.N.E., and S-ReSC NSSs were 0.695, 0.665, and 0.656, respectively (p = 0.003, p = 0.011, and p = 0.017, respectively). No statistically significant difference was found between the grades of all four NSSs and the complication rates. The study showed a strong correlation between CROES, STONE, and S-ReSC NSSs in predicting SF status after supine m-PNL. However, none of the NSSs could predict the complications.