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

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.

Status

Not yet recruiting

Phases

Unknown

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT07670780

Enrollment

120

Registered

2026-06-26

Start date

2026-06-22

Completion date

2028-08-28

Last updated

2026-07-01

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Diaphragmatic Dysfunction, Postoperative Pain, Shoulder Arthroscopic Surgeries

Keywords

ınterscalene block, Shoulder Arthroscopy, Regional Anesthesia, Postoperative Analgesia, Diaphragmatic Function, Ultrasound-Guided Block, Infraspinatus-Teres Minor Interfascial Plane Block

Brief summary

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.

Detailed description

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.

Interventions

PROCEDUREUltrasound-Guided Interscalene Block

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.

PROCEDUREUltrasound-Guided Infraspinatus-Teres Minor Interfascial Plane Block

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.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

DOUBLE (Subject, Outcomes Assessor)

Masking description

Participants and outcome assessors are blinded to group allocation.

Intervention model description

Participants will be randomized into three parallel groups: interscalene block, infraspinatus-teres minor interfascial plane block, and control group.

Eligibility

Sex/Gender

ALL

Age

18 Years to 65 Years

Healthy volunteers

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

Design outcomes

Primary

Measure	Time frame	Description
Postoperative Pain Intensity	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	24 hours after surgery	Comparison of postoperative diaphragmatic excursion measured by ultrasonography between study groups.

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Jul 2, 2026