The radius and the ulna are bones in the forearm. Fractures, or breaks, of the radius and ulna are among the most common bone injuries. People may sometimes fall on their arms or use them to brace ...

Your radius is one of the two bones in your forearm, along with the ulna. It’s the bone that attaches closest to your thumb. A radius fracture, sometimes called a radial fracture, is a break of this ...