What is the function of the proximal radioulnar joint?

The function of the proximal radioulnar joint is primarily to facilitate supination and pronation of the forearm. This joint allows the radius to rotate around the ulna, which is essential for movements such as turning the palm upward (supination) or downward (pronation). This rotational ability is crucial in many everyday tasks, such as turning a doorknob or using a screwdriver.

The proximal radioulnar joint, located near the elbow, works in conjunction with the distal radioulnar joint at the wrist to enable a full range of rotational motion, confirming that its main role involves these specific movements of the forearm.