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Comparison of Lithotomy Versus Lateral Position in Retrograde Intrarenal Surgery for Lower Calyceal Stones Less Than 2 cm

NCT ID: NCT07310966

Last Updated: 2025-12-30

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

NOT_YET_RECRUITING

Clinical Phase

NA

Total Enrollment

70 participants

Study Classification

INTERVENTIONAL

Study Start Date

2026-01-01

Study Completion Date

2026-06-01

Brief Summary

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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.

Detailed Description

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Conditions

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Renal Calculi

Keywords

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lithotomy position lateral position lower calyx FURS RIRS

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

DOUBLE

Participants Outcome Assessors

Study Groups

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Lithotomy position group

patients of this group undergo RIRS in Lithotomy position

Group Type ACTIVE_COMPARATOR

Lithotomy Position

Intervention Type PROCEDURE

Patients undergo RIRS in lithotomy position

Lateral position group

patients of this group undergo RIRS in lateral position

Group Type ACTIVE_COMPARATOR

Lateral position

Intervention Type PROCEDURE

Patients undergo RIRS in lateral position

Interventions

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Lithotomy Position

Patients undergo RIRS in lithotomy position

Intervention Type PROCEDURE

Lateral position

Patients undergo RIRS in lateral position

Intervention Type PROCEDURE

Eligibility Criteria

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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.
Minimum Eligible Age

18 Years

Maximum Eligible Age

80 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Menoufia University

OTHER

Sponsor Role lead

Responsible Party

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Ammar Fathi Mohamed AlOrabi

Dr

Responsibility Role PRINCIPAL_INVESTIGATOR

Locations

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Menoufia Faculty of Medicine

Shebin El-Kom, Menoufia, Egypt

Site Status

Countries

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Egypt

Central Contacts

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Ammar Alorabi

Role: CONTACT

Phone: +201067608011

Email: [email protected]

Facility Contacts

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Ammar Aziz

Role: primary

Other Identifiers

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Patient position in RIRS

Identifier Type: -

Identifier Source: org_study_id