What could be the problem?...knees hurt 80% of the time....I can't climb stairs...I can't get out of a chair..My knees hurt at rest...In January I had a partial knee replacement on my right knee...In 2004 I had a ACL replacement on my left Knee.....now I have bone on bone...not sure if a knee replacement will help with all the pain I am having now...anyone how there knows what could be the problem?...I can't live like this much longer..I need help........Bev in Michigan