Which bone structure provides added stabilization to the elbow joint?

The olecranon process of the ulna plays a vital role in stabilizing the elbow joint. This bony prominence is located at the upper end of the ulna and forms the point of the elbow that can be felt on the outside of the joint. Its anatomy contributes to the overall structure of the elbow by fitting into the trochlea of the humerus during flexion and extension of the arm.

During arm movements, particularly when flexing the elbow, the olecranon process locks into the humerus, preventing excessive movement and thereby providing a stable hinge action. This stability is crucial for functional activities that involve lifting or carrying, as it ensures that the joint remains aligned and properly supported.

Other structures mentioned, while important to the elbow's function and biomechanics, do not contribute to stabilization in the same manner as the olecranon. For instance, the trochlea is involved in the articulation but does not add stability on its own; the radial head contributes to rotational movements but lacks a locking mechanism; similarly, the coronoid process helps in flexion resistance but does not provide the same degree of stability as the olecranon.