Injured or diseased joints are often examined and treated through arthroscopy, i.e. orthopaedic keyhole surgery. A thin metal tube equipped with a light and a tiny video camera is inserted in the joint through a small hole. While the camera sends images to a monitor, some surgical operations can be conducted through another hole, using small instruments. Arthroscopic lavage and debridement are for example performed simultaneously with arthroscopy. These procedures can be used to remove fragments of loose cartilage to reduce pain and increase the mobility of the joint, thereby often providing short-term relief.