Jerry,
My Orthopod used this stuff.
Synvisc 3 injections 2 weeks apart. At first I thought it was snake oil but it actually worked. After 6 weeks I finally noticed some relief and it lasted for 6 months. Last year I finally gave in to the knife and sawsall and had both knees replaced. My knees no longer bother me but there are still some limitations as to what I can do. The fun times are just beginning when you turn 60! Bad knees sure limits a persons mobility.
I suffered with mine till I was 64, sure wish I had done the replacemants earlier.
All the best...