I am called the camel girl because my knees turn backward.

He began to turn away, but she saw his knees turn to water.

"Your knees have turned to jelly at the mere thought of the monster, but you still won't let me go alone."

It felt as if her knees turned to water.

He threw out a hand, catching the wall as his knees turned to water under him.

His knees turned to water and he slumped down, sagging against the man who held him.

He saw a knee coming, turned his face in time to take it on the side of the jaw.

His knees turned to rubber and he fell back against the cliff.

I put my hand where her knee had turned to hardened plaster.

This condition causes the knees and feet to turn inward.