DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Knuckle joint replacement surgery. Orthopaedic surgeons carrying out a procedure to replace a patient's arthritic knuckle joint with a prosthetic implant. The head of the metacarpal (hand bone) and phalanx (finger bone) will be replaced with a pyrocarbon implant. Here, they are inserting a trial prosthesis (blue) into the metacarpal to assess the fit.
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