DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Knuckle joint replacement surgery. Close-up of the closed incisions in a patient's hand after surgery to replace two arthritic knuckle joints with a prosthetic implant. The head of the metacarpals (hand bones) and phalanges (finger bones) were replaced with a pyrocarbon implant.
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