The rear leg bends at the knee, supporting all the body weight.

He is tall enough so that his legs bend at the knees against the edge of the seat.

But his legs, which had been pummeled by guards for several days, could no longer bend.

She tried to fall, but her legs couldn't bend.

So she had to stand, because her leg would no longer bend.

At least, he tried to; his right leg did not bend well, and he nearly fell.

Durable, strong legs will not bend when unit is installed.

My leg won't bend, but I can pull myself along and make it.

If your legs bend the right way, Henry, then yes, you may sit down.

He discovered that the dead man's legs didn't bend at the knees anymore.