The research was presented to the American College of Rheumatology conference in New Orleans.
The American College of Rheumatology recommends doctors confirm four of 11 criteria for a proper diagnosis.
British Society for Rheumatology president Dr Andrew Bamji said it was a small study so difficult to draw firm conclusions.
In an abstract published on the Web site of the American College of Rheumatology, Prexige stopped knee arthritis pain better and faster than Celebrex, the current leader in the arthritis market.
"I think the FDA made a decision about the overall safety of this drug and felt that there were alternatives, " says Steve Abramson, chairman of rheumatology at New York University's Hospital for Joint Diseases.
Dr Chris Deighton, the president of the British Society for Rheumatology, said it was an "interesting study" which "gives us more clues" about how the environment can affect the chances of getting rheumatoid arthritis.
In particular, the potential for mesenchymal stromal cells (MSCs) to differentiate into multiple phenotypes - like fat, cartilage and bone - make them ideal building blocks for bone and cartilage tissue engineering in orthopaedics and rheumatology.
Today's results, which will be elucidated more fully at the American College of Rheumatology's annual meeting in New Orleans later this month, confirm what many suspected: Prexige, formerly known as Cox 189, is more powerful than its rivals.
The statement said the merger might reduce the hospitals' incentives to improve the quality of specialist services, which include rheumatology, rehabilitation, general medicine, general surgery, geriatric medicine, dermatology, clinical haematology, oral and maxillofacial surgery, cardiology and palliative medicine.
Dr Jon Tobias, a consultant senior lecturer in the rheumatology department at Bristol Royal Infirmary and advisor to the National Osteoporosis Society, said a drug that could stimulate bone growth, rather than simply arrest deterioration, should be more effective at preventing fractures.
Dr. Roy Fleischmann, clinical professor at the University of Texas Southwestern Medical Center at Dallas, was the lead author for this work, which was presented a month ago at the 65th annual scientific meeting of the American College of Rheumatology in San Francisco.
Focused on the treatment of patients with serious and difficult-to-treat autoimmune and inflammatory disorders, Questor has been very successful in marketing Achtar, which is also commonly used in treating patients suffering from infantile spasms, an epileptic syndrome, as well in patients patients burdened with rheumatology.
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