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The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
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Related Experiment Video

Updated: Jul 30, 2025

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

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Published on: March 12, 2021

Acute Shoulder Injuries in Adults.

Lauren Meryl Simon¹, Van Nguyen¹, Ngozi Margarete Ezinwa¹

¹Loma Linda University, Loma Linda, California.

American Family Physician

|May 16, 2023

Summary

Acute shoulder pain is common in primary care. Most injuries resolve with conservative treatment like slings and rehabilitation, but some require surgery.

Area of Science:

Orthopedics
Sports Medicine
Primary Care

Background:

Acute shoulder pain is a frequent primary care complaint, often resulting from trauma in sports.
Injuries can affect shoulder joints, rotator cuff, bones, or nerves.

Purpose of the Study:

To outline the diagnosis and management of acute shoulder injuries in primary care.
To differentiate between conservative and surgical treatment indications.

Main Methods:

Comprehensive history and physical examination to identify injury type and severity.
Assessment of common shoulder pathologies like acromioclavicular and glenohumeral joint disease, and rotator cuff injuries.

Main Results:

Most acute shoulder injuries are managed conservatively with slings and rehabilitation.

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Surgical intervention is reserved for specific fractures (clavicle, humerus) and severe joint injuries (acromioclavicular, glenohumeral dislocations, rotator cuff tears).

Conclusions:

Accurate diagnosis through history and physical exam is crucial for appropriate treatment.
Conservative management is effective for many acute shoulder injuries, while surgical referral is necessary for specific indications.