I was told about this many years ago from a woman I used to know, but there was not much written then about it and my knees/joints were not as bad then. I received a letter from my French friend this week who told me her husband (a patissier who is always on his feet at work) has started to get really bad with knee pain and was recently diagnosed by x-ray as having OA. She told me had had had three weekly injections of HA into his knee joint but as yet hasn't said how beneficial it is. Has anyone here had experience of it? Does it affect any RA meds?