Aim: to study an adaptability of the Clavien–Dindo classification of complications for contact ureterolithotripsy.
Materials and methods. A total of 506 patients with ureteric stones who were undergone 545 endoscopic interventions in the Urologic Department of “MONIKI” named after M.F. Vladimirsky were included in retrospective analysis.
Results. Complications of grade 1, II, IIIa and IIIb were noted in 39 (7.1%), 24 (4.3%), 15 (2.8%) and 14 cases (2,6%), respectively. Among the complications of grade IVa, an acute pyelonephritis was complicated by the septic shock. The complication of grade IVb developed in 1 case (0.2%). There were no complications of Grade V.
The Clavien–Dindo classification allows to grade only postoperative complications and attempts to adapt it for the assessment of intraoperative complications can lead to the distortion of study results.
Conclusion. The uncontrolled use of the Clavien–Dindo classification in all areas of surgery can lead to a decrease in its accuracy, thereby reducing its value as fairly universal tool. In our opinion, a further work aimed to the development of strict criteria for the different grades of complications of the Clavien–Dindo classifications is needed. We believe it is possible and necessary to develop a single tool for the assessment of complications of typical interventions within a single
surgical area.

Keywords: Clavien–Dindo classification, ureteric stones, contact ureterolithotripsy, complications