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Rotator cuff tear

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Rotator cuff tear

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High Yield Notes
5 pages
Flashcards

Rotator cuff tear

22 flashcards
Questions

USMLE® Step 1 style questions USMLE

2 questions

USMLE® Step 2 style questions USMLE

3 questions
Preview

A 10-year-old boy is found by emergency workers after a car crash, crying loudly with contusions to both legs, weakness abducting the right arm without swelling, and vital signs normal for his age. He states that his arm and shoulder were pulled backward in the seat belt during the crash. Which of the following trauma emergency priority does this patient belong to?

Transcript

The rotator cuff refers to a group of four muscles and their tendons, which help to stabilize the shoulder when it’s moving particularly during rotational motion.

So, a rotator cuff tear is when one or more of the tendons of the muscles of the rotator cuff are torn.

The shoulder is a complex of bones, ligaments, muscles and their tendons that all work together to connect the upper limb to the chest, allowing necessary movement and providing stability.

The round head of the humerus fits and rotates inside the shallow glenoid cavity of the scapula.

Just above the glenoid cavity, the scapula extends two bony processes; the acromion and the coracoid processes which serve as attachment for ligaments and muscle tendons.

The ligaments of the capsule of the glenohumeral joint hold the head of the humerus inside the glenoid cavity.

The coracoacromial ligament forms an arch between the coracoid process and the acromion and it prevents the head of the humerus from upward dislocation.

In addition to these ligaments, the shoulder is supported by the four rotator cuff muscles, also called the SITS muscles, for Supraspinatus, Infraspinatus, Teres minor, and Subscapularis.

The SITS muscles form a cuff that surrounds the head of humerus to make it stable and help it move, specifically in abduction, internal, and external rotation.

Below the acromion lies the acromial bursa, which is a small sac filled with rubbery synovial fluid, that provides lubrication and prevents the rotator cuff tendons, especially the supraspinatus tendon, from rubbing against the acromion as the joint moves.

A rotator cuff tear may occur when the tendons are violently stretched, called the acute tear, like when you jerkily lift up something which is too heavy, or accidentally fall on an outstretched arm.

This most commonly affects the supraspinatus tendon at its insertion on the greater tubercle of the head of the humerus, because it’s under a lot of tension when the shoulder is abducted.

Now, the tears may be partial, which is where the tendon is damaged but not completely torn, and may even go unnoticed.

Alternatively, the tear may be a full thickness tear, where the tendon is completely detached from the humerus.

In contrast to an acute tear, there may also be a chronic tear due to regular wear and tear, which usually occurs in the elderly.

That’s because the blood supply to the rotator cuff tendons reduces over time making it harder for them to heal after an injury.

Summary
A rotator cuff tear is a tear of one or more of the tendons of the four rotator cuff muscles of the shoulder. A rotator cuff injury can include any type of irritation or overuse of those muscles or tendons, and is among the most common conditions affecting the shoulder. The cuff is responsible for stabilizing the glenohumeral joint, abducting, externally rotating, and internally rotating the humerus. When shoulder trauma occurs, these functions can be compromised.
Sources
  1. "Robbins Basic Pathology" Elsevier (2017)
  2. "Harrison's Principles of Internal Medicine, Twentieth Edition (Vol.1 & Vol.2)" McGraw-Hill Education / Medical (2018)
  3. "Pathophysiology of Disease: An Introduction to Clinical Medicine 8E" McGraw-Hill Education / Medical (2018)
  4. "CURRENT Medical Diagnosis and Treatment 2020" McGraw-Hill Education / Medical (2019)
  5. "MR Imaging of Rotator Cuff Injury: What the Clinician Needs to Know" RadioGraphics (2006)
  6. "Delineation of diagnostic criteria and a rehabilitation program for rotator cuff injuries" The American Journal of Sports Medicine (1982)
  7. "Compressive cryotherapy versus ice—a prospective, randomized study on postoperative pain in patients undergoing arthroscopic rotator cuff repair or subacromial decompression" Journal of Shoulder and Elbow Surgery (2015)