ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Hip replacement surgery. Image 26 of 30. Testing a new hip socket (white, in the pelvis) with a trial ball implant (green). The socket and the real ball implant will articulate as seen to form the new hip joint. This surgery is usually performed in response to arthritis, the degeneration of the joints, and restores mobility to people who would otherwise be incapacitated by pain and unable to move freely. For a sequence of images showing the full surgery, see M551/340-369. For a sequence showing the operation on the pelvis, see images M551/360-366.
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