Cathe, I was just wondering, I know you had a knee operation, but lately I noticed my right knee has been making a crackling noise whenever I do squats or lunges. It sounds really wierd but it doesn't hurt at all. I have been working out for many years, so it isn't like I am new at this. It that normal, I know some crackling noise is, just thought you might know. Thanks and take care, Pam.