My experience with Dr. Yi was excellent. I had pain in my knee for a while. I found Dr. Yi based on reviews, qualifications and his patient care philosophy. He looked at my x-rays and felt the knee indicated torn ligaments and arthritis, which was news to me. He drained the knee and injected cortisone which helped immediately. After three weeks at a follow-up appointment, my knee is doing much better. If it acts up again, I told him that I would be back!