I was having pain behind my knees. A few months ago I did have 4 jell treatments to my knees. This did not seem to work. I then went to Dr. Alpert. He did look the e-rays that I had. He determined that I needed a cortisone shot which was administered. It did take a day or so for them to take effect. I will say this did work. I want to thank Dr. Alpert and his assistant for their very thorough analysis and treatment. I am feeling much better.