Shoulder injuries can be difficult to self-diagnose. Both times I injured mine I was convinced that I had broken my collar bone. I heard it pop both times and the pain was fairly intense, but I don't recall it being as painful as when I broke my ankles (on separate occasions). I also didn't feel the distinctive clicking indicative of a facture. I've heard that you feel the pain from a rotator cuff injury in the front of the shoulder joint.