The term "radioulnar" refers to the relationship between the two long bones in the forearm: the radius and the ulna. These bones run parallel to each other and play a crucial role in the movement of the wrist and elbow. The radioulnar joint allows for the rotation of the forearm, enabling actions such as turning the palm up or down. There are two main types of radioulnar joints: the proximal radioulnar joint, located near the elbow, and the distal radioulnar joint, found near the wrist. Both joints facilitate the pronation and supination movements of the forearm, which are essential for various daily activities.