Abstract:Objective To investigate the safety and efficacy of percutaneous nephrolithotomy combined with retrograde intrarenal surgery in prone positioning in treatment of complex kidney stones.Methods Clinical data of 67 patients with complex kidney stones from January 2014 to August 2018 were retrospectively analyzed. 31 patients underwent percutaneous nephrolithotomy combined with retrograde intrarenal surgery in prone positioning (Double endoscopy group), 36 patients underwent minimally invasive percutaneous nephrolithotomy (PCNL group), operation time, bleeding volume, the Clavien-Dindo classification, stone clearance rate and the median length of hospital stay were compared and analyzed.Results All the 67 patients underwent operation successfully without serious complications. The operation time of the Double endoscopy group is longer than that of the PCNL group (P = 0.000), and the median length of hospital stay is shorter (P = 0.000). There is no significant difference in the quantitative indicator of surgical difficulty (S.T.O.N.E.) and kidney stone size between the two groups (P > 0.05). The bleeding volume, the Clavien-Dindo classification and stone clearance rate of the Double endoscopy group is better than PCNL group (P < 0.05).Conclusion Percutaneous nephrolithotomy combined with retrograde intrarenal surgery in prone positioning in treatment of complex kidney stones is safe, effective and reliable. As this results shows, it has characteristics such as high stone clearance rate with a low complication rate, and is worthy of clinical application.