MedTrace Logo

Deltoid Muscle Contribution to Shoulder Function

NCT03881462 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 12

Last updated 2020-01-14

No results posted yet for this study

Summary

There is only one study in the literature about the quantitative effect of M. deltoideus on the movement of the shoulder. Here, the author described a 35-80% loss of abduction power after selective blockade of the N. axillaris. Gerber, on the other hand, found a loss of abduction force of 73-86% after blockade of the suprascapular nerve. These results are partly contradictory, which is why the investigators think that further investigation is needed.

For many questions in the field of shoulder orthopedics, this knowledge would provide an important additional basis for therapeutical decision-making. For example, in the treatment of rotator cuff ruptures but also in the implantation of both inverse and anatomical shoulder prostheses. Also, statements about different outcome prognoses could be made more precisely.

Therefore, the investigators would like to perform muscle strength measurements of the deltoid muscle on 12 healthy volunteers on the dominant arm.

Abduction, flexion, external rotation and internal rotation Mm. Infraspinatus, Supraspinatus and Subscapularis are tested respectively.

The investigators plan to carry out the measurements three times before and after an-anaesthesiological nerve block of the axillary nerve thus inactivating the deltoid muscle (performed exclusively by an anesthesiologist specialized in regional anesthesia). The success of the nerve block is confirmed by needle electromyographies (EMG) by a neurologist specialized in electrophysiology. Using EMG neurogenic pathologies within the tested muscles are also ruled out.

In order to exclude relevant rotator cuff pathologies the investigators will perform shoulder radiography in three planes and sonography of the rotator cuff before conducting the experiment described above.

Conditions

  • Nerve Injury
  • Nerve Palsy

Interventions

PROCEDURE

Axillary nerve block for artificial deltoid muscle palsy

Axillary nerve block block (AXNB): The ultrasound probe is placed transversally in the infraclavicular region with the arm in 90° abduction. The brachial plexus and its cords are identified l lateral to the brachial artery. The posterior cord is identified by ultrasound and is blocked - or, if the axillary nerve visible too - the axillary nerve is selectively blocked when it leaves the posterior cord and lies on the subscapular muscle accompanied by the posterior circumflex humeral artery. Using an in-plane technique, a short bevel connected to a nerve stimulator with the setting 0.5 mA current intensity, 0.1 ms impulse duration and 2 Hz impulse frequency for dual guidance, will be advanced until its tip is positioned near the nerve without eliciting motor contractions. After careful negative (for blood) aspiration local anesthetic will be applied until the targeted neuronal structure is surrounded by the injected fluid.

Sponsors & Collaborators

  • Balgrist University Hospital

    lead OTHER

Study Design

Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
65 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2019-05-01
Primary Completion
2019-07-30
Completion
2019-09-30

Countries

  • Switzerland

Study Locations

More Related Trials

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03881462 on ClinicalTrials.gov