Comparison of Lithotomy Versus Lateral Position in Retrograde Intrarenal Surgery for Lower Calyceal Stones Less Than 2 cm
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Lithotomy Position, Lateral position.
- Who it may be relevant to
- Registry conditions: Renal Calculi. Basic parameters: 18 years — 80 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Egypt
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Comparison of Lithotomy Versus Lateral Position in Retrograde Intrarenal Surgery for Lower Calyceal Stones Less Than 2 cm: A Randomized Controlled Trial
Overview
Retrograde intrarenal surgery (RIRS) is an established minimally invasive treatment for renal stones, particularly for lower calyceal stones less than 2 cm, offering acceptable stone-free rates with low morbidity. However, stone clearance in the lower calyx remains technically challenging due to unfavorable anatomy, limited scope deflection, and gravity-dependent fragment retention. Patient positioning during RIRS has been suggested as a modifiable factor that may influence endoscopic access, stone relocation, and surgical ergonomics. The lithotomy position is conventionally used during RIRS, while the lateral position has been proposed to facilitate stone migration and improve lower calyceal access through gravitational assistance. Existing studies comparing patient positioning during RIRS are limited, with most evidence derived from retrospective analyses or non-randomized designs. Therefore, this randomized controlled trial aims to compare lithotomy versus lateral positioning during RIRS for lower calyceal stones less than 2 cm in terms of operative and clinical outcomes.
Interventions
- Procedure Lithotomy Position
Patients undergo RIRS in lithotomy position - Procedure Lateral position
Patients undergo RIRS in lateral position
Primary outcome measures
- Stone Free Rate [Time frame: 1 month]
Secondary outcome measures (2)
- Operative time [Time frame: The operative time]
- Complications [Time frame: 1 month]
Eligibility criteria
Inclusion criteria
- Adults aged ≥18 years.
- Single or multiple lower calyceal renal stones with stone size <2 cm confirmed by NCCT.
- Negative urine culture.
- Presented cases.
Exclusion criteria
- Multiple stones involving renal pelvis or other calyces.
- Anatomical anomalies affecting ureteroscope access (horseshoe kidney, malrotation, ureteral strictures).
- Pregnancy.
- Prior ipsilateral renal surgery.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Allocation
- Randomized
- Model
- Parallel assignment
- Masking
- Double blind
- Primary purpose
- Treatment
Study locations
Egypt · 1 center
- Menoufia Faculty of Medicine — Shebin El-Kom
Identifiers
NCT: NCT07310966 · Patient position in RIRS