@ellerbracke I remembered to ask! He said a lot of people do have clicking knees. I asked, but 40%? He said he would have said more like 5 – 10%. So, there you have it. If your therapist said 40% and that is correct out there, your orthopedic surgeons don't sound like they are doing a very good job. I am sure some are unavoidable but that's an awfully high percent.
It was a good session. We went through the exercises, I wanted to make sure I was doing them right, and he did correct me on one. It actually wasn't one that he had given me. He gave me another too. Hold onto the kitchen sink, grasping your hands over the sink edge. Position your feet about shoulder length apart, stick out your butt, and bend, like you were sitting.