Conclusion
All of four scoring systems (RUSS, modified S-ReSC, Ito’s nomogram and R.I.R.S.) could predict stone-free status after f-URS, however the AUC values are not satisfactory in our large patient cohort. Although these scoring systems were not developed for predicting post-operative complications, they were associated with post-operative complications in our study. All these four scoring systems have some significant limitations. The ideal scoring system is yet to be developed.