The knees are hinge joints, unlike ball joints. They only allow the thigh to move up and down. They cannot move horizontally.
Knees can not move horizontally
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by Chen Zhonghua Taiji Academy on 2008/08/21
The knees are hinge joints, unlike ball joints. They only allow the thigh to move up and down. They cannot move horizontally.
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Previous post: China Trip 2008
Next post: Joined at the waist