What is hypertrophic ac joint with encroachment on the supraspinatus tendon?

Hypertrophic acromioclavicular (AC) joint refers to an enlargement or overgrowth of the AC joint, often due to degenerative changes or injury. This condition can lead to encroachment or impingement on the supraspinatus tendon, which is part of the rotator cuff and is responsible for shoulder abduction. The resulting impingement can cause pain, reduced range of motion, and functional limitations in shoulder movement. Treatment options may include physical therapy, pain management, or surgical intervention if conservative measures fail.