SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Knee joint. Coloured Magnetic Resonance Image (MRI) of a coronal section through the healthy knee of a man aged 30. The knee is the joint between the femur or thigh bone (upper centre) and tibia bone (lower centre). The articulation surfaces of these bones are covered by cartilage; the bones are joined by two cruciate ligaments. The joint cavity (orange region running horizontally between the bones) is filled with a synovial fluid which lubricates the movement of the joint. MRI scanning uses radio waves and an electromagnet to create "slice" images though the body.
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