What is the verb for knee?

My knee is hurting; I fell off a cliff.

I have a knee fetish - I can't help it

I was walking through an Iraqi village, but couldn't help noticing that one woman had one knee showing, and was following me: how unorthodox.

I've come from Alabama with a banjo on my knee.

When I'm gardening, I kneel on my right knee the most.

I have rheumatism in my knee.

I can touch my knee with my shoulder.

Any of the above could be appropriate sentences including the Word 'knee'. I hope you find one is useful for whatever purpose you had in mind.