ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Femur head. Wire-frame computer illustration of the top of a healthy human femur (thigh bone). The rounded head (upper left) fits into the acetabulum, a cup-like cavity in the pelvis, to form a ball and socket joint. The hip joints support the weight of the upper body as well as allowing an enormous range of movement.
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