STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Knee joint. Light micrograph of a section though a knee joint. The femur is to the top with the patella to the right. Anterior and posterior cruciate ligaments (red) attach to the tibia below. The ends of the long bones are covered in articular cartilage that lines the synovial cavity. In osteoarthritis this cartilage becomes worn and rough causing inflammation and pain and may lead to the need for surgical knee replacement. Magnification: x5 when printed at 10 centimetres high.
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