PATRICK LANDMANN / SCIENCE PHOTO LIBRARY PATRICK LANDMANN / SCIENCE PHOTO LIBRARY
Torn knee cartilage. Arthroscope (endoscope) views of a tear in the meniscus cartilage of the knee. There is a medical probe in the image upper left. There are two menisci in each knee. They are crescent-shaped pieces of cartilage which reduce friction in the moving joint and increase its stability. They can sometimes be repaired by arthroscopic (minimally invasive) surgery.
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