The primary function of the annular ligament is to stabilize the radial head, ensuring that it remains properly seated within the joint while allowing for the necessary movement of the forearm. This stabilization is essential during rotational motions, such as turning the palm up or down. The ligament acts as a protective band around the radial head, preventing dislocation and facilitating smooth movements between the radius and ulna. Without the annular ligament, the radius could potentially shift out of place during forearm rotation, leading to pain and decreased mobility. Overall, the annular ligament plays a pivotal role in maintaining the integrity of the elbow and forearm function, enabling activities that require fine motor skills as well as heavier lifting.