JEAN-DENIS LAREDO, ISM / SCIENCE PHOTO LIBRARY JEAN-DENIS LAREDO, ISM / SCIENCE PHOTO LIBRARY
Coloured X-ray (frontal view) showing a knee joint affected by chondrocalcinosis, or pseudogout. In this condition, crystals of calcium pyrophosphate are deposited in soft tissues such as cartilage, the connective tissue found in joints. In this case, deposits can be seen in the meniscus cartilage, between the tibia (large lower bone) and femur (upper bone). Affected joints are red, swollen and extremely tender. Treatments include the use of nonsteroidal anti-inflammatory drugs. If these fail a corticosteroid drug may be injected into the affected joints. The underlying cause of pseudogout is unknown.
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