I had bilateral knee replacement done in 2008. I went through the operation with no pain. Now, it's a different story. I have jolts of muscle and tendon pain. By that, I mean, if I take a step I get a jolt, which sometimes throws me forward. Sometimes, when I am walking I get a spasm of pain, then it will go away. I do not have constant pain. My walking is not very straight. Anyone with this kind of problem?