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Lying on your back vs. stomach: which is better for kidney stone surgery?

NCT ID NCT07627503

Symptom relief Sponsor: Sana'a University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study will compare two ways to position patients during surgery to remove large kidney stones. One group will lie on their back (supine), the other on their stomach (prone). Researchers want to see which position leads to fewer complications, less pain, and lower costs. The trial plans to enroll 140 adults aged 18 to 70 with kidney stones larger than 2 cm.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Surgical procedure (percutaneous nephrolithotomy in supine or prone position)
What this could lead to
If supine PCNL proves safer and less painful, it could become the preferred position for kidney stone surgery, improving recovery and reducing costs.
What could go wrong
This is a small, early-stage trial that has not yet started. Results may not apply to all patients, and surgical risks like infection or bleeding remain.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 140 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Jun 2026

An estimate. Start dates often move.

Expected to finish

Jun 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 70 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients aged 18-70 years. * Diagnosis of solitary or multiple renal stones with a cumulative diameter greater than 2 cm, confirmed by imaging (CT KUB). * Patients eligible for standard PCNL (24-30 Fr). * American Society of Anesthesiologists (ASA) physical status I-III. * Willingness and ability to provide informed consent. Exclusion Criteria: * Patients with active urinary tract infection (UTI) not responding to antibiotics. * Patients with bleeding diathesis or on anticoagulant therapy that cannot be safely discontinued. * Patients with anatomical abnormalities of the kidney or urinary tract that preclude standard PCNL. * Pregnant women. * Patients with severe cardiopulmonary disease where general anesthesia or prolonged surgical positioning is contraindicated. * Patients with a history of previous ipsilateral renal surgery. * Patients unwilling or unable to comply with follow-up protocols.

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Conditions

The condition(s) this trial relates to.

Kidney Calculi nephrolithiasis

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Kidney calculi Nephrolithiasis

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Al-Kuwait University Hospital

    Sanaa, 13078, Yemen

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