There are two web sites for this FDA approved product.
http://www.Synviscone.com pretty good site for patient information.
http://www.genzyme.com gives a bit more information.
Of note is the report that symptoms may take up to one month to improve. Reports that up to six months of symptom relief is possible. The injection of synviscone ( hylan G-F 20) can be repeated according to the literature.
I'll talk with the Ortho docs and get their input.
My $.02.
RF 1