Ok here is something that my daughter found out. She got a swollen toe and couldn't figure out what she had done. It was really swollen too. She had trouble walking etc. I told her she probably got bit by a spider. Anyways she told me to go buy some Arnica from the GNC store. I asked what it was. She said that it was a homeopathic product made from a plant. All natural. Well I went and got it for her. The guy there told me that people take it for all kinds of aches, pains, and injuries. I have no clue as I don't ususally use these products. Anyways my daughter took one pill and two hours later the swelling was way done and she could move her big toe again like normal. I was surprised. So maybe it would work on your knee??????? I have no idea. I had a bad right knee for a long time and finally had a replacement and it was the best thing I had done. I wonder now if this natural medicine would have prolonged the time involved before the replacement. Who knows.>???????