Question

why can't we bend our elbow backward ​

Answer 1

I think because these join like elbows and knees are like hinges fixed on the door the ligaments in these join cannot move more than 180 degree

Explanation:

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Answer 2

Answer: Structurally joints don't bend both ways because there are physical components within their design that prevent or resist motion. This could be bone, such as the elbow joint, or it could be ligamentous restraint, such as in the knee. All joints in the body are a compromise between mobility and stability.