Читать книгу Arthritis For Dummies - Barry Fox - Страница 21

This is truly a freewheeling joint — it’s ready for anything! Up, down, back, forth, or around in circles. The bone attached to a ball-and-socket joint can move in just about any direction. The end of one bone is round, like a ball, whereas the other bone has a neat little cave that the ball fits into. Your shoulders and hips have ball-and-socket joints. Swimming the backstroke is a perfect example of the kind of range of motion made possible by these joints. See Figure 1-5 for an example of a ball-and-socket joint.

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FIGURE 1-5: A ball-and-socket joint. These joints can move just about any direction — up, down, back, forth, or around in circles.