Interscalene Block Versus Infraspinatus-Teres Minor Interfascial Plane Block for Shoulder Arthroscopy

This prospective randomized controlled study aims to compare the effects of interscalene block, infraspinatus-teres minor interfascial plane block, and a control group on postoperative analgesia and diaphragmatic function in patients undergoing shoulder arthroscopy. A total of 120 patients will be enrolled and allocated into three groups. Postoperative pain scores, opioid consumption, rescue analgesic requirements, and diaphragmatic function will be evaluated and compared among the groups. The study seeks to determine whether the infraspinatus-teres minor interfascial plane block can provide effective postoperative analgesia with less impact on diaphragmatic function compared with interscalene block.

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Key information

Conditions

Postoperative Pain Diaphragmatic Dysfunction Neurologic Manifestations Pain Pain, Postoperative Pathologic Processes Pathological Conditions, Signs and Symptoms Postoperative Complications Shoulder Arthroscopic Surgeries Signs and Symptoms

Age range

18 year–65 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

About this study

Shoulder arthroscopy is associated with significant postoperative pain. Interscalene block is widely used for analgesia but may impair diaphragmatic function because of phrenic nerve involvement. The infraspinatus-teres minor interfascial plane block has been proposed as an alternative regional anesthesia technique that may provide adequate analgesia while preserving diaphragmatic function. This randomized controlled trial will include 120 adult patients undergoing elective shoulder arthroscopy. Participants will be randomized into three groups: interscalene block, infraspinatus-teres minor interfascial plane block, and control. Pain scores, opioid consumption, time to first rescue analgesia, diaphragmatic excursion measured by ultrasound, and block-related complications will be recorded and analyzed.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Age between 18 and 65 years
ASA physical status I-II
Scheduled for elective shoulder arthroscopy
No known allergy to study medications
No psychiatric disorder
No opioid dependence
Ability to use patient-controlled analgesia (PCA) and complete VAS assessments
No contraindication to peripheral nerve blocks
Written informed consent obtained

Exclusion criteria

Refusal to participate
Uncontrolled hypertension
Chronic pain or ongoing analgesic treatment
Significant cardiac disease (coronary artery disease, arrhythmia, heart failure)
Diabetes mellitus

Treatment and study plan

Ultrasound-Guided Interscalene Block

Procedure

Ultrasound-guided interscalene brachial plexus block is performed before induction of anesthesia for postoperative analgesia in patients undergoing shoulder arthroscopy. The block is administered using ultrasound guidance according to institutional practice.

Ultrasound-Guided Infraspinatus-Teres Minor Interfascial Plane Block

Procedure

Ultrasound-guided infraspinatus-teres minor interfascial plane block is performed before induction of anesthesia for postoperative analgesia in patients undergoing shoulder arthroscopy. The block is administered using ultrasound guidance according to institutional practice.

Primary outcomes

Postoperative Pain Intensity

Time frame: 0, 2,4, 6, 12, and 24 hours after surgery

Postoperative pain intensity assessed using the Visual Analog Scale (VAS) , ranging from 0 to 10, where 0 indicates no pain and 10 indicates the worst imaginable pain. higher scores indicate greater pain intensity. compared between study groups.
Diaphragmatic Excursion

Time frame: 24 hours after surgery

Comparison of postoperative diaphragmatic excursion measured by ultrasonography between study groups.

Sponsors and collaborators

Lead sponsor

TC Erciyes University

Other

Registry information

Official study title

Comparison of the Effects of Interscalene Block and Infraspinatus-Teres Minor Interfascial Plane Block on Postoperative Analgesia and Diaphragmatic Function in Patients Undergoing Shoulder Arthroscopy.

Important dates

Study start: 2026
Primary completion: 2028
Study completion: 2028
First posted: Jun 26, 2026
Registry last updated: Jul 1, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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