I've been searching the various comments of people who have had injections in their knees for treatment of bone on bone pain. Despite the FDA's approval of Orthovisc, the satisfaction rating of Hyalgan appears much greater by patients who have had this injection instead of Orthovisc or even Synvisc. So why would my doctor order Orthovisc claiming it's the same as Hyalgan when clearly that does not seem to be the case?