Glucosamine Revisited, Again
Our OrthoBuzz report of the “near-death” of glucosamine/chondroitin may have been premature, according to a recent study published online in the Annals of the Rheumatic Diseases. The randomized, double-blind study assigned 606 patients with knee osteoarthritis and moderate-to-severe pain to receive either glucosamine (500 mg) and chondroitin (400 mg) three times a day, or one daily dose of the COX-2 inhibitor celecoxib (200 mg).
The study was designed to discern noninferiority between the supplements and celecoxib, and the results over six months showed equivalent benefits in both groups. WOMAC measures of pain decreased by 50.1% in the supplement group and 50.2% in the celecoxib group. Both groups also showed a >50% reduction in the presence of joint swelling, and adverse events were low in both groups.
One thing readers may want to consider when mulling over these results: The study was sponsored by the manufacturer of the glucosamine/chondroitin product used in the trial, and all authors disclosed financial relationships with that manufacturer.
An additional perspective on these and other glucosamine/chondroitin findings comes from JBJS Deputy Editor for Research Tom Bauer, MD, an ultra-marathon runner who’s free of arthritis symptoms and does take glucosamine/chondroitin supplements. Dr. Bauer emphasizes the distinction between preventing osteoarthritis and treating it. “Most published studies in humans, like this recent one, have tested glucosamine/chondroitin in patients with pre-existing osteoarthritis,” he said. “It’s a tall order to expect any oral medication to induce actual restoration of the articular surface, so I’m eager to see a decent chondroprotective study of these supplements in athletes who do not have osteoarthritis.”