SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Knee joint. Coloured Magnetic Resonance Image (MRI) of a sagittal 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 (at centre left) is filled with a synovial fluid which lubricates the movement of the joint. Muscles of the leg are coloured red and blue (lower right). MRI scanning uses radio waves and an electromagnet to create "slice" images through the body.
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