Have you tried all kinds of knee rehab but are still getting nowhere? It may be due to the issue not being at the knee.... the knee is just the area of the body being overloaded hence the pain coming in there.
In an assessment, we take a full injury history, if you have not had a direct injury to the knee the likelihood is that the pain in the knee is due to overload because a different joint not working correctly.
If you suffer from knee pain we can help with our full injury assessment where we listen, take a full injury history and look at all injuries together as they are likely to be impacting upon each other.
Remember one body has lots of systems but they ALL have to work together.