A simple dislocation does not have any major bone injury.. A complex dislocation can have severe bone and ligament injuries.. In the most severe dislocations, the blood vessels and nerves that travel across the elbow may be injured.If this happens, there is a risk of losing the arm. Some people are born with greater laxity or looseness in their ligaments
https://orthoinfo.aaos.org/en/diseases–conditions/elbow-dislocation