In which direction do elbow joint dislocations typically occur after a fall onto an extended elbow?

Elbow joint dislocations commonly occur in a posterior direction following a fall onto an extended elbow. This type of injury typically happens when the elbow is locked in extension, and a significant force is applied, causing the ulna and radius to dislocate posteriorly in relation to the humerus. The mechanism of injury involves the tremendous stress on the joint during impact, leading to an instability that primarily displaces the joint backward.

Understanding the anatomy helps clarify this phenomenon. The stability of the elbow joint is enhanced when it is flexed; however, in full extension, it becomes more vulnerable to dislocation. As a result, the posterior dislocation is the most common presentation in such scenarios. Dislocations in other directions are less prevalent due to the structural confines and the bony anatomy of the joint.