HYALURONIC ACI D is a synovial fluid and is now being used in two forms (naturally occurring and synthetic) as an arthritis treatment. I don't personally have any data or experience with clinical results. Maybe Dr. Dave or physioguy can chime into this and educate us all.
I have worked with many knee problems and used other supplements and exercise to eliminate the symptoms. What do you know of the application? I will get on line in the next two days , make a few calls, and bone up on the subject. Vik