I tried other options for repairing my right knee, which had degenerated a great deal and was painful. I met with Dr. Yi after having an x-ray. We looked at it together and he suggested I have a full knee replacement. I had the surgery in November and I followed the exercise instructions. It was painful for a few weeks at the site. It is now February and I am practically back to normal- 90% improvement. I made a wise decision to have Dr. Yi do the surgery. He did an excellent job.