What is Acromioclavicular (AC) Joint Injury/Separation ?

Learn Acromioclavicular (AC) Joint Injury/Separation Meaning and Definition Acromioclavicular (AC) joint injury, also known as AC joint separation, is a condition where the ligaments connecting the collarbone (clavicle) to the shoulder blade (scapula) are damaged or torn. This injury often occurs due to a direct blow to the shoulder or a fall on an outstretched arm, resulting in pain, swelling, and limited range of motion in the affected shoulder.