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Knee meniscus tear. Coloured magnetic resonance imaging (MRI) scan of a coronal (front) section through the right knee joint of a 52 year old woman, showing a tear in the lateral (outer) meniscus (small purple areas, centre left). The thigh bone (femur, top) and shin bone (tibia, bottom) articulate at the knee joint. Two cartilage discs, or menisci (blue), lie between the bones, providing a smooth surface for movement. A tear can occur for a number of reasons, including violent trauma, degeneration of tissue with age, or prolonged physical activity. Most tears heal with rest, anti-inflammatory drugs and physical therapy.
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