Quadro-Iliac vs Thoracolumbar Interfascial Plane Block for Analgesia After Single-Level Lumbar Disc Surgery

February 2, 2026 updated by: Samsun University

Comparison of the Postoperative Analgesic Efficacy of the Quadro-Iliac Plane Block and the Classical Thoracolumbar Interfascial Plane Block in Single-Level Lumbar Disc Surgery: A Prospective Randomized Controlled Trial

The investigators aim to compare the postoperative analgesic efficacy of the classical thoracolumbar interfascial plane block and the Quadro-iliac plane block for postoperative analgesia management after lumbar disc surgery.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

Lumbar spinal stenosis can lead to variable signs and symptoms such as back pain, radiating pain to the lower extremities, and reduced walking capacity. Lumbar disc surgery itself causes significant pain due to extensive dissection and muscle retraction during the procedure. A multimodal analgesic approach is preferred for postoperative pain management after lumbar spine surgery. The addition of regional anesthesia techniques can reduce opioid-related side effects and is associated with earlier mobilization, shorter hospital stay, and improved patient satisfaction.

For patients undergoing lumbar disc surgery, the classical thoracolumbar interfascial plane (TLIP) block and the Quadro-iliac plane block (QIPB) provide effective analgesia for postoperative pain control.

Study Type

Interventional

Enrollment (Estimated)

70

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Patients aged 18-70 years,
  • Classified as ASA physical status I-III,
  • Scheduled to undergo single-level lumbar spinal surgery under general anesthesia
  • Who agree to participate in the study by providing written informed consent

Exclusion Criteria:

  • History of bleeding diathesis or current anticoagulant therapy
  • Known allergy or hypersensitivity to local anesthetics or opioid medications
  • Infection at the planned block injection site
  • Previous lumbar spine surgery
  • History of gabapentinoid or corticosteroid use within the last 3 weeks
  • Inability to use a patient-controlled analgesia (PCA) device
  • Suspected pregnancy, confirmed pregnancy, or breastfeeding
  • Refusal to undergo the procedure or to participate in the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Other: Active Comparator: Group QİPB
The Quadro-iliac plane block will be performed 30 minutes before lumbar spine surgery
Other: Quadro-iliac plane block
Quadro-iliac plane block will be performed under ultrasound guidance before the induction of general anesthesia.
Other: Active Comparator: Group TLİP
The classical thoracolumbar interfascial plane (TLIP) block will be performed 30 minutes before lumbar spine surgery.
Other: Classical thoracolumbar interfascial plane block
Classical thoracolumbar interfascial plane block will be performed under ultrasound guidance before the induction of general anesthesia.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Opioid consumption
Time Frame: 24 hours
In the postoperative period, patients will be given opioids according to their pain density with a patient-controlled device, and the daily Morphine consumption in Patient Controlled Analgesia device will be collected and compared between groups.
24 hours

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Perioperative pain intensity
Time Frame: 24 hours

Changes in the Numerical Rating Scale (NRS) will be recorded at rest and during movement. The participant's baseline NRS will be recorded, followed by measurements before and after neuraxial positioning and up to 24 hours post-surgery.

The NRS is a unidimensional measure of pain intensity in adults. It is a segmented numerical version of the Visual Analog Scale (VAS) where the participant selects a whole number (0-10) that best represents the intensity of their pain. The 11-point numerical scale ranges from '0' representing one end of the pain spectrum (e.g. 'no pain') to '10' representing the other end (e.g. 'worst imaginable pain').
24 hours
Postoperative nausea and vomiting
Time Frame: 24 hours

Postoperative nausea and vomiting (PONV):

During follow-up, patients who experience nausea or vomiting will be evaluated using a verbal descriptive PONV scale (0=None, 1=Mild nausea, 2=Moderate nausea, 3=Single episode of vomiting, 4=More than one episode of vomiting).
24 hours
Quality of recovery 15 scale
Time Frame: 24 hours after surgery

Postoperative Quality of Recovery 15 in Turkish scale. The QoR-15 (Quality of Recovery-15) questionnaire is a simple and practical tool used to assess postoperative recovery.

It consists of 15 items, each scored on a numeric scale from 0 to 10, resulting in a total score ranging from 0 to 150.

Based on the total score, postoperative recovery is categorized as follows:

136-150: Excellent recovery

122-135: Good recovery

90-121: Moderate recovery

0-89: Poor recovery
24 hours after surgery

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Samsun University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 6, 2026

Primary Completion (Estimated)

July 30, 2026

Study Completion (Estimated)

July 30, 2026

Study Registration Dates

First Submitted

December 31, 2025

First Submitted That Met QC Criteria

January 12, 2026

First Posted (Actual)

January 16, 2026

Study Record Updates

Last Update Posted (Actual)

February 3, 2026

Last Update Submitted That Met QC Criteria

February 2, 2026

Last Verified

December 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • OMUKAEK 2025/279

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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