Word: acetabulum
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...socket part of the metal ball-and-socket joint. Dr. Wilson drove a long shaft (bearing the ball) into the marrow cavity and fitted a flange (just below the ball) to the head of the femur. Another flange, on the socket, he screwed to the rim of the acetabulum (the socket cavity in the pelvic bone). A collar to hold the ball in the socket completed the device (see diagram). Patient Snyder will be walking in three weeks...
Last week Drs. Samuel Kleinberg and Herman Solomon Lieberman of Manhattan offered a reliable indicator. On an x-ray picture of the child's torso they draw a line through the centres of both hips. Then they draw a line through the roof of each hip socket (acetabulum). The angles formed by the roof lines crossing the centre line the doctors call the acetabular index. In normal hips the angles measure between 20° and 27.5°. If the angles exceed 27.5°, dislocation probably will occur...
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