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Tissue samples were taken from a joint in your elbow during an arthroscopy.

3 bones meet at the elbow. These are the humerus and the two bones in the forearm. These are called the ulna and the radius. In the elbow there are several joints between these 3 bones. This is how we are not only able to bend and stretch the arm, but also to twist the forearm, for example when driving in a screw.

An arthroscopy first involves making a small incision in the skin. A thin tube is advanced through this incision. There is a camera at the top of the tube. The camera transmits images of the inside of the joint to a screen. Instruments such as forceps and scissors can be inserted into the joint through other small incisions.