The US Center for Sports Medicine explains that if the shoulder and upper arm are painful – and the pain worsens with movement – the injury is likely that of a dislocated shoulder. Sufferers should look for a large bump around the shoulder – either in the front or the back – and the shoulder may look square, not round. Remember: if in doubt, commence dislocated shoulder rehab right away, with rest, ice, and compression – and call your healthcare provider as soon as possible to make an appointment. Successful dislocated shoulder rehab begins with your initiative.