AC joint is a part of your shoulder joint that is comprised of the assembly of your collar bone (clavicle) with the acromion process of your shoulder blade. Problems here can lead to loss of shoulder movement, pain, and difficulty performing tasks that require the usage of your arm. In case you have shoulder pain, your physical therapist may assess your condition and determine the best treatment. During the examination, your PT will execute the AC joint compression evaluation. The AC joint is a very stable joint, and just small motions occur there. Still, you can suffer a sprain of the ligaments that hold your AC joint collectively. When this occurs, it is called an AC joint separation. This will probably cause significant shoulder pain and you might have difficulty moving your arm normally. An AC joint separation shouldn't be confused with a shoulder dislocation. A shoulder dislocation happens where the ball and socket of the shoulder joint match. An AC joint separ