The radial notch is a small, shallow indentation located on the ulna bone in the forearm. It serves as a point of articulation for the head of the radius, allowing for the rotation of the forearm. This movement is essential for actions such as turning a doorknob or using a screwdriver. The radial notch is part of the proximal radioulnar joint, which plays a crucial role in the overall function of the arm. Proper alignment and health of this joint are important for maintaining a full range of motion and preventing injuries during physical activities.