An interventional study of The T-Tilt position in Stone, Kidney, Stones, Kidney and Stone;Renal, sponsored by Ondokuz Mayıs University. Recruiting at 1 site in Turkey (Türkiye). Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-08-15.
Sponsored by Ondokuz Mayıs University · Not applicable, Interventional, and Treatment
The goal of this clinical trial is to determine whether the surgical position during retrograde intrarenal surgery (RIRS) affects stone-free rates in adults with kidney stones. The main questions it aims to answer are:
Researchers will compare patients undergoing RIRS in the standard lithotomy position to those in the modified lithotomy position (30-degree Trendelenburg with elevated surgical side) to assess its impact on stone clearance and surgical outcomes.
Participants will:
This study aims to improve surgical techniques and patient outcomes in kidney stone treatment.
598 studies on the registry are indexed under Kidney Calculi; 163 are open to participants now.
This study's planned enrollment of 128 is above the median of 90 across 461 interventional studies indexed under Kidney Calculi.
Browse Kidney Calculi studies →Ondokuz Mayıs University is the lead sponsor of 262 studies on the registry; 68 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
In this arm we will use standard lithotomy position as control group.
Procedure: The T-Tilt position
The T-Tilt position is a modified lithotomy position used during retrograde intrarenal surgery (RIRS). In this position: The patient is placed in a 30-degree Trendelenburg position, meaning the head is slightly lower than the feet. The surgical side is elevated at a 30-degree angle to improve access to the kidney. This modified positioning is designed to enhance stone clearance, particularly by facilitating the movement of stone fragments away from the lower kidney calyces, where residual stones often remain. Researchers will compare this position to the standard lithotomy position to determine its impact on stone-free rates and surgical outcomes.
Stone-Free Rate After Retrograde Intrarenal Surgery
The percentage of participants with no residual kidney stones (≤4 mm fragments) on non-contrast computed tomography (CT) at 6 weeks postoperatively.
Time frame: 6 weeks post-surgery
Postoperative Complication Rate
he percentage of participants experiencing any postoperative complications, classified according to the Clavien-Dindo grading system.
Time frame: Within 30 days post-surgery
Rehospitalization Rate
The percentage of participants requiring hospital readmission due to complications related to the surgical procedure
Time frame: Within 30 days post-surgery
Total Laser Energy Used
The total Holmium:YAG laser energy (Joules) applied during stone fragmentation
Time frame: Intraoperative
Documents are hosted by the registry — open the source record to download them.
Plan to share: No
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Ondokuz Mayıs University