they are called hinge joints because they allow you the move your knee and elbow up and down
because they hinge your bones together.
because it works like a door hinge. When the door hinge is opened wider the angle is greater and when opened less the angle would be lesser.
Think of a hinge on a door. They allow the door to open and close based on that one hinge. Door hinges do not allow the door to pivot or move in any direction besides open/close or front/back. The...
it alowes a door to swing shut with ease
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