Chondroitin slows progression and relieves symptoms of knee oste...( Osteoarthritis (OA) causes disabilit...),Health

Osteoarthritis (OA) causes disability and is a major public health problem. A new study examined the effect of chondroitins 4 and 6 sulfate (CS) on OA progression and symptoms. CS, unlike other chondroitin sulfate products sold as dietary supplements in the U.S., has been approved as a prescription symptomatic slow acting drug for OA in many European countries. The study was published in the February issue of Arthritis & Rheumatism (http://www3.interscience.wiley.com/journal/76509746/home).

Led by Andre Kahan of the University of Paris Descartes in Paris, the randomized, double-blind, placebo-controlled study involved 622 patients with OA from France, Belgium, Switzerland, Austria and the U.S. Patients had knee X-rays at the time of enrollment and at 12, 18 and 24 months. The X-rays were evaluated for joint space loss and patients were also assessed for OA symptoms and pain.

The results showed that "long-term administration of CS over 2 years can prevent joint structure degradation in patients with knee OA," the authors state. Joint space loss was significantly reduced in the CS group, fewer patients had progression of joint space width, and CS reduced pain in those taking it compared to the placebo group. CS was well-tolerated and there were no significant differences in the frequency of adverse events between the two groups.

The study showed that there was faster improvement regarding pain during the first year in the CS group compared to the placebo group. This may be due to the fact that all of the patients had pain symptoms, so the effect of CS was more noticeable early on. Since those who took a placebo also had decreased pain in the first year, it may also be due to the natural course of the disease. The authors note that the study involved CS, which is used as a prescription drug and that the results cannot be generalized to other chondroitin sulfate
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