MICHELLE DEL GUERCIO / SCIENCE PHOTO LIBRARY MICHELLE DEL GUERCIO / SCIENCE PHOTO LIBRARY
Knee operation. Surgeon using a drilling tool during a total knee replacement operation. A prosthetic knee joint will be inserted into the leg. Knee joint replacements are usually performed when the original joint has been damaged by rheumatoid arthritis or osteoarthritis. The prosthesis can restore mobility and independence to otherwise disabled people.
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