What is the term used when the Supraspinatus muscle frictions against the acromion?

The term used when the Supraspinatus muscle experiences friction against the acromion is known as sub-acromial bursitis. This condition arises when the sub-acromial bursa, a fluid-filled sac located beneath the acromion, becomes inflamed due to repetitive friction or irritation caused by the movement of the Supraspinatus muscle and tendon.

When the arm is raised, the Supraspinatus can be compressed against the acromion, especially if there is any narrowing of the space, which can lead to pain and restricted movement. The inflammation of the bursa typically results in pain, particularly during overhead activities, and may lead to symptoms of impingement, which is why recognizing and addressing sub-acromial bursitis is crucial in managing shoulder conditions effectively.

Understanding this term is essential for recognizing common shoulder issues, especially for those studying anatomy or involved in physical rehabilitation, as it highlights the mechanics behind shoulder pain and potential treatment pathways.