Knee meniscus injury. Coloured combined lateral 3D computed tomography (CT) and magnetic resonance imaging (MRI) scan of the knee of a 30-year-old man with a meniscal tear (centre right). The menisci are fibrocartilage crescents that act as shock absorbers between the femur (thigh bone, top) and tibia (shin bone, bottom). A tear in a meniscus can be caused by trauma, most often a sports injury, or by wear and tear. Treatment depends on the severity of the tear. Minor tears may respond to physical therapy and anti-inflammatory drugs, but more serious injuries require surgical treatment. For the location of the injury marked by arrows, see image C018/0639.
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