Hi, I'm Jenny and I've had 14 knee surgeries. I think there's been no action on your request as whole books are written about the questions you've asked. Can you narrow it down a little? Can you tell us what's wrong with your knees and what has been advised? Your age would help too. A young person with knee arthritis is going to be treated differently from an older person(say age 50 up).
There are so many options these days depending on the problem that we need a place to start and that means a little more detail.