This lesson introduces the rotator cuff, explains how its tendons can become injured, and reviews factors that increase the likelihood of a tear. Understanding these foundations helps explain why tears can arise suddenly or develop gradually.
The rotator cuff is a group of four muscles and their tendons that help stabilize the glenohumeral joint, where the upper arm meets the shoulder blade. The cuff helps keep the humeral head centered while the arm moves, particularly during abduction (raising the arm away from the body) and rotation.
All flashcards
What is the rotator cuff?
It is a group of four muscles and their tendons that help stabilize the shoulder joint and control arm movement.
Which tendon is most often torn?
The supraspinatus tendon is the most commonly injured rotator cuff tendon.
What distinguishes an acute tear from a chronic tear?
An acute tear follows a distinct sudden event; a chronic tear develops gradually, often through degeneration and repetitive stress.
What is eccentric loading?
It occurs when a muscle produces force while lengthening, such as when someone must support a load as it suddenly becomes heavier.
Name three risk factors for rotator cuff tearing.
Examples include increasing age, repetitive overhead activity, smoking, diabetes, increased body mass index, and tendon degeneration.
Quiz questions
What can a shoulder X-ray reveal in suspected rotator cuff disease?Answer: Indirect findings such as bone spurs or calcification.
Why should an imaging finding of a rotator cuff tear be interpreted alongside symptoms and examination findings?Answer: Tears are common in people who have no shoulder symptoms.
Which imaging procedure introduces contrast into the shoulder joint and may clarify uncertain cases?Answer: MR arthrography.
What does subacromial decompression do in shoulder surgery?Answer: It removes a small amount of bone beneath the acromion.
Which situation may prompt consideration of early surgery for a rotator cuff tear?Answer: A substantial acute tear with major functional loss in a young, active person.
Based on the Wikipedia article Rotator cuff tear, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.