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Hip joint replacement: MedlinePlus Medical Encyclopedia
Hip joint replacement is surgery to replace all or part of the hip joint with a man-made (artificial) joint. The artificial joint is called a prosthesis . Description
Hip
The hip joint is made up of four bones. That isn't obvious when looking at the adult structure which obviously only has two parts: the socket (acetabulum) from the pelvis and the ball from the femur. But if you look closely at that pelvis, you can see that it is a composite bone - not too unlike the skull - wherein several bones join together to create a single functional structure. The three sub bones of the pelvis are called innominate bones (in-ohm-min-it) because orthopedists mastered saying "The Leith police dismitheth us." and thus needed something harder to say. The largest innominate bone is the ilium (ill -e-yum) or Iliac bone .
Most people only think that there is one way to sleep: Go to sleep at night for 6-8 hours, wake up in the morning, stay awake for 16-18 hours and then repeat. Actually, that is called a monophasic sleep cycle , which is only 1 of 5 major sleep cycles that have been used successfully throughout history. The other 4 are considered polyphasic sleep cycles due to the multiple number of naps they require each day.
Alternate Sleep Cycles
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