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Obese person's lower legs. X-ray of the legs of a 23 year old patient who weighs 175 kilograms. The inside bones are the tibias (shin bones), with the smaller fibulas on the outside. The ankles are at bottom. Folds of fat and skin are seen around the bone. Obesity can damage joints due to the extra pressure put on them, often leading to osteoarthritis. (KEYSTONE/SCIENCE PHOTO LIBRARY/ZEPHYR/SCIENCE PHOTO LIBRARY)