Shoulder arthritis is inflammation as part of your shoulder joint that happens as a result of cartilage decline. The inflammation causes pain, stiffness and issue in accomplishing your every day things to do.  An ACJ dislocation/separation can happen once the acromioclavicular capsular ligaments and coracoclavicular ligaments. are broken. Acromio-clavicular joint https://www.theorthopaedicandpainpractice.com/what-are-shoulder-joint-dislocations/?_gl=1*164kc8h*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB