What does the subacromial bursa protect?

The subacromial bursa serves a critical role in protecting the supraspinatus muscle tendon, which is part of the rotator cuff. This bursa is located beneath the acromion and above the supraspinatus tendon, acting as a cushion that reduces friction during shoulder movements. When the shoulder joint is in motion, the bursa allows the supraspinatus tendon to glide smoothly beneath the bony acromion, thereby preventing irritation or impingement that could lead to pain or injury.

The protection offered by the subacromial bursa is especially important in activities that involve overhead movements, where the risk of friction and subsequent injury is heightened. This anatomical relationship emphasizes the importance of the bursa in maintaining the health and functionality of the shoulder joint, particularly in maintaining the integrity of the rotator cuff.