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Background <p>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&#xa0;mm) renal pelvic stones.</p> Methods <p>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.</p> Results <p>The mean age of the patients was 50.8 ± 11.2&#xa0;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 mm<sup>2</sup>; <i>p</i> = 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; <i>p</i> = 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, <i>p</i> = 0.012).</p> Conclusions <p>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.</p>

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Risk factors for steinstrasse formation after extracorporeal shock wave lithotripsy for renal pelvic stones

  • 期刊论文

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  • 发表日期：

    2026年1月6日

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  • Mubariz Aydamirov,
  • Kadir Karkin,
  • Guclu Gurlen,
  • Ergun Alma,
  • Adem Altunkol,
  • Eyup Kaplan,
  • Bugra Aksay,
  • Gurkan Akbulut,
  • Hakan Sigva,
  • Ediz Vuruskan,
  • Muslum Ahmet Tunckiran

摘要

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.