Which joint is primarily responsible for forearm rotation?

The proximal radioulnar joint plays a crucial role in the rotation of the forearm, primarily allowing for pronation and supination movements. This joint is formed between the head of the radius and the radial notch of the ulna, enabling the radius to rotate around the stationary ulna.

During pronation, the radius crosses over the ulna, while in supination, the radius returns to a position parallel to the ulna. These movements are essential for various daily activities, such as turning a doorknob or using tools, highlighting the joint's function in enabling effective forearm rotation.

While the distal radioulnar joint also contributes to forearm rotation, its role is secondary compared to that of the proximal radioulnar joint. The elbow joint primarily acts as a hinge joint for flexion and extension, and the shoulder joint is primarily responsible for movements of the arm rather than direct forearm rotation.