# Aydamirov M. et. al., 2026: Risk factors for steinstrasse formation after extracorporeal shock wave lithotripsy for renal pelvic stones. Peter Alken Monday, 03 August 2026 58 Hits [ 0 Comments ](https://www.storzmedical.com/en/disciplines/literature-database-blog/database-lithotripsy/aydamirov-m-et-al-2026/?layout=listings#comments) Aydamirov M, Karkin K, Gurlen G, Alma E, Altunkol A, Kaplan E, Aksay B, Akbulut G, Sigva H, Vuruskan E, Tunckiran MA. BMC Urol. 2026 Jan 6;26(1):29. [doi: 10.1186/s12894-025-02044-7](https://pubmed.ncbi.nlm.nih.gov/41495712/) ## Abstract Background: This study aimed to identify predictive factors for the formation of steinstrasse following extracorporeal shock wave lithotripsy (SWL) in patients with medium-sized (10-20 mm) renal pelvic stones. Methods: This retrospective cohort study, data of 718 patients who underwent SWL for urinary tract stones were analyzed and single, unilateral, radio-opaque renal pelvic stones were included in the study. Patient age, sex, stone side, shape (round/non-round), size, surface area (SA), and presence of hydronephrosis were recorded. Patients were divided into two groups depending on the presence of steinstrasse: Group 1 (with steinstrasse) and Group 2 (without). Demographic, clinical, and radiological parameters were compared between the groups. Results: The mean age of the patients was 50.8 ± 11.2 years. The average number of SWL sessions was 2 (range 1-4). Group 1 included 12 patients (23.1%), while Group 2 comprised 40 patients (76.9%). The mean SA in Group 1 was significantly higher than in Group 2 (145.43 vs. 111.69 mm2; p = 0.044). Round stones were more frequently observed in Group 1, whereas non-round stones predominated in Group 2 (83.3% vs. 62.5%, respectively; p = 0.008). The overall SWL success rate was determined as 76.9%. Logistic regression analysis revealed that round stones increased the risk of steinstrasse by 8.333 times (OR = 8.333, 95% CI = 1.604-43.288, p = 0.012). Conclusions: SA was higher in patients who developed steinstrasse. Since the likelihood of steinstrasse formation is elevated in medium-sized round renal pelvic stones, pre-stenting may be appropriate. ## Comment Peter Alken One way to avoid wasting time when reading publications is to take a look at the conclusion first—not in the abstract, but in the actual text. If the authors qualify their findings in a concluding sentence, such as... “Multicenter studies including larger patient populations … could provide valuable contributions to the literature.” I prefer not to read but to wait until “Multicenter studies including larger patient populations” are published and repeat the procedure before reading these studies. Peter Alken 0 #### Comments No comments made yet. Be the first to submit a comment Wednesday, 19 August 2026 I have read and agreed to the [Privacy Policy](https://www.storzmedical.com/javascript:void(0);)