Auto Incidents: A unexpected, effective impact from a motorcar incident can dislocate the shoulder. Causes of Shoulder Instability / Dislocation Shoulder instability and dislocation can happen resulting from a number of causes, such as: Trauma: A sudden and forceful effect or injury to your shoulder, for instance a slide or https://www.theorthopaedicandpainpractice.com/what-are-shoulder-joint-dislocations/?_gl=1*164kc8h*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB