The Elbow - Overview
The elbow joint is formed between the humerus ( in the upper arm ) and the ulna and radius ( the forearm bones ). It is a composite of two joints between the humerus and the ulna and the radius and the ulna that are interconnecting and form the elbow joint. It has two important functions as a consequence of the two joint in one viz: acting as a hinge in the upper limb and as part of the forearm allowing rotation so that the palm can be placed facing upwards ( supination ) or downwards ( pronation ). As a hinge joint it plays an important role in the manipulation of the environment. The hinge function is key to being able lift objects, feed oneself, attend to hygiene needs, throw objects, etc. Rotating about the axis of the forearm ( pronation/supination ) is important for optimising the position of the hand in relation to the external environment. In short the elbow is very important for human beings who stand on their two legs and use their arms to manipulate their environment.
