BMC urology · 2026
Risk factors for steinstrasse formation after extracorporeal shock wave lithotripsy for renal pelvic stones.
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Aydamirov Mubariz, Karkin Kadir, Gurlen Guclu, Alma Ergun, Altunkol Adem, Kaplan Eyup, Aksay Bugra, Akbulut Gurkan, Sigva Hakan, Vuruskan Ediz, Tunckiran Muslum Ahmet
Аннотация
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.
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.