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The shoulder is not a hinge joint. You probably meant elbow. It is a hinge along with the knee. It is called a hinge because it works much the same as a door that can open and close by having one edge shared with the door jam that holds the door where it is but allows it to move in one plane, back and forth.

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10y ago
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9y ago

The knees have hinge joints which allows them to bend. A hinge joint is said to be a modified sellar joint with limited movement.

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Q: Why is the shoulderarmand knee called a hinge joint?
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