"I hope it isn't the expectation that my knee is going to fall off."

"I'm just a little bit worried about how my knee is really going to end up doing," he said.

I looked at the face, and sat down abruptly, my knees gone to water.

His knee went bad as well, forcing him off the job.

For a second, she thought her knees were going to fail again.

This had been much more powerful - enough to make her knees go weak.

Once his knees and legs went out from under him, the problem was he couldn't run for conditioning.

Claire's knees went weak as she felt his hands on her at last.

Mark's knees went weak and he leaned on the wall.

A knee like the corner of a foundation stone went into my back.