Dislocation is usually a function of impact loading forces, their direction, magnitude, and torque/movements applied to the radius-ulna with the arm flexed and configured into a supination or pronation. Experimental investigations of over 70 baboons and 21 human cadaver arms as well as static Finite Element Modeling (FEM) of the elbow joint developed, have shown that during the early stages of most low impact posterior elbow dislocations, the elbow joint is sufficiently stable in most instances after closed reduction and early mobilization. This treatment is chosen since it remains the bone or soft tissue stability is retained. These results of different flexion, pronation, and supination also show the ligaments remain intact. Perfect dislocation, while difficult to achieve experimentally, is usually associated with a displacement of the radial head posteriorly after the ligaments are partially torn. The radial head may function as a stabilizer in elbow dislocation as seen experimentally to produce bony failure with only a fracture of the coronoid process and/or anterior radial head. The radius and ulna displaces posteriorly with stretching of the capsule and ligament; the radial annular ligament tears followed by posterior lateral capsule tear. Sequential tearing of the medial collateral ligament is followed by a rupture of the radial collateral ligament, anterior capsule and the rest of the posterior capsule.