A separated shoulder occurs where the collarbone (clavicle) and shoulder blade ([no-glossary]scapula[/no-glossary]) meet. It happens when the [no-glossary]ligaments[/no-glossary] that normally hold the collar bone down are torn. The outer end of the collarbone slips out of place. This usually is caused by a severe blow to the shoulder, or by falling on an outstretched hand. The collar bone will stick up and a bump can be seen on top of the shoulder.