Abstract：Objective To investigate the incidence of clinical nonsensical residual stone (RF) after ureteroscopic lithotripsy(URS) and its CT predictive factors.Methods The clinical data of 265 patients with upper urinary tract stones treated by continuous URS in our hospital from January 2018 to December 2022 were retrospectively analyzed. The patients were divided into non-RF group (164 cases) and RF group (101 cases) according to the presence or absence of RF. The clinical data of the two groups were compared, and the influencing factors of RF occurrence were analyzed by univariate and multivariate logistic regression.Results Univariate logistic regression analysis showed that the stone location, number of stones, target stone diameter and ureteroscopy type were associated with RF occurrence after URS (all P<0.05). The results of multivariate logistic regression analysis showed that the length of target stone was an influential factor for RF occurrence after URS (P<0.05).Conclusions Target stone length diameter is an influential factor for the occurrence of RF after URS. The threshold value of CT stone length diameter detection as 2 mm can be used as an effective indicator for the evaluation of URS efficacy.
