Which structure is commonly compressed in shoulder impingement during overhead motions?

Which structure is commonly compressed in shoulder impingement during overhead motions?

• A. Rotator cuff tendons and subacromial bursa.
• B. Biceps tendon alone.
• C. Glenoid labrum.
• D. Acromioclavicular ligament.

Answer: (A)

The main idea is that shoulder impingement happens when the space under the acromion gets crowded as the arm moves overhead. In that subacromial space lie the rotator cuff tendons—especially the supraspinatus—and the subacromial bursa. Repeated elevation or a structural narrowing compresses these tissues between the humeral head and the acromion, leading to tendon irritation, bursitis, and pain. That’s why the rotator cuff tendons and the subacromial bursa are the structures commonly compressed during overhead motions. The biceps tendon isn’t the primary structure involved in this impingement pattern, and the glenoid labrum or the acromioclavicular ligament belong to different shoulder problems—labral injuries or AC joint issues, respectively—not the typical impingement mechanism under the acromion.

The main idea is that shoulder impingement happens when the space under the acromion gets crowded as the arm moves overhead. In that subacromial space lie the rotator cuff tendons—especially the supraspinatus—and the subacromial bursa. Repeated elevation or a structural narrowing compresses these tissues between the humeral head and the acromion, leading to tendon irritation, bursitis, and pain. That’s why the rotator cuff tendons and the subacromial bursa are the structures commonly compressed during overhead motions.

The biceps tendon isn’t the primary structure involved in this impingement pattern, and the glenoid labrum or the acromioclavicular ligament belong to different shoulder problems—labral injuries or AC joint issues, respectively—not the typical impingement mechanism under the acromion.