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why are we not be able to rotate our leg at the knee or our hand at the elbow?
 

Dear student.

This is due to the presence of hinge joint in knee and elbow. Hinge joint allow movement in one direction only i.e., to and fro movement.

Movement in all direction or rotation is allowed by ball and socket joint. It is present in shoulders and hips.

Hope this information will clear your doubts about the topic.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.
Regards.
 

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Because the are hinge joints. These type of joints move in only one direction
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You might be surprised to discover that your legs are on backwards compared to your arms. (The simple experiment presented below will show you this.) If you stand up straight with your palms facing forward, your forearms will bend forward at the elbow, but your lower legs will bend backward at the knee.
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you can see on net also
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BECAUSE IT HAS A HINGE JOINT WHICH ALLOWS MOVEMENT IN ONE DIRECTION ONLY
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i dont know sorry
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Because they are hinge joints which allow only back and forth movements and they are not ball and socket joint that they will allow a complete revolution.
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because of hinge joint
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because our knee joint &elbow joint were hinge joints & the hinge joints are the joint which can move in one direction....
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