Old shoulder injury. collarbone is popped out all the time, occasional pain and discomfort in joint. cause and treatment? thanks.

Dislocation?: Where is it popped out? One of the most common injuries to the shoulde is a disclocation of the joint where the collar bone joins the shoulder. It's called the acromioclavicular joint. If you fall onto the side of your shoulder, this joint can be dislocated. If it happened a long time ago. There may be arthritis now in that joint. If painful get it evaluated.

Instability.: You could have symptomatic collarbone instability. see an orthopedic sports medicine shoulder surgeon, who can evaluate you and come up with a treatment plan.