Elbow
The elbow is made up of three bones – the upper arm bone (humerus) and the forearm bones (radius and ulna). These bones meet to create joints that allow you to bend your elbow (flexion), straighten your elbow (extension) and rotate or twist your forearm – turning your palm to face the ceiling (supination) or to face the floor (pronation).
Surrounding the elbow joint is a joint capsule, ligaments and muscles. These structures in combination with the bones help to create a stable and mobile joint.