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Hip resurfacing arthroplasty is surgery that replaces the damaged outer surfaces of the femoral head found at the top of the thighbone and, if needed, the cup-shaped socket where the thighbone meets the pelvis in the hip joint. People younger than about age 55 who have hip osteoarthritis have been difficult to help with...
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Concept
In Hirschsprung's disease, certain nerve cells (ganglion cells) in a portion of the colon are missing. Because the muscles in that area can't relax, the muscle contractions that normally push food and digestive waste through that part of the colon can't occur. The picture on the right shows a colon in which the rectum...
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