Have you had surgery on your knee? Water excercise is great for the joints. See if you have a hospital in your area that does free classes for those who need to be easy on there joints. Like maybe for Arthritus support groups.
I was a professional dancer for many years competing and such and I dislocated my knee cap, pulled legiments, tendons, and such. I had orthroscopic surgery on knee. Doc told me I could never dance again. :(
He was wrong because many years later my knee is strong from excercise and continued dance. At times, I get a sharp dull pain in my knee from running also. Make sure your shoes are supportive when you walk. Also try leg lifts and floor excercise. Stretching a lot helps build the knee muscle...Hope some of this helps....S 
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