Although the concept of a single elbow dislocation mechanism, in which all dislocations start from the lateral side of the elbow joint and progress to the medial side, has never been able to explain the various conflicting experimental and clinical observations thus far, new studies and proposals for a valid mechanism have not been reported. The new proposal for posteromedial and posterolateral dislocation of the elbow joint according to the authors' study and the new treatment algorithm based on this new study can explain the various clinical and experimental results that have been difficult to explain, and provide a reasonable approach to the treatment of elbow dislocations.