ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Obese person's lower leg, coloured X-ray. At top centre is the femur (thigh bone), at centre is the tibia (shin bone), with the smaller fibula to its left. The ankle is at bottom centre. Folds of fat and skin are pink. The knee (upper centre) appears damaged; the space between the femur and tibia should be even on both sides. Obesity can damage joints due to the extra pressure put on them, often leading to osteoarthritis.
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