Scientists say they had trouble interpreting their results because patients who took placebos had a smaller loss of cartilage than they should have.
Glucosamine and chondroitin are two popular supplements used to fight arthritis and joint pain. A new study finds they don't seem to work any better than placebo to slow the loss of knee cartilage in osteoarthritis. Researchers reporting in the journal Arthritis and Rheumatism admit some of their findings were confusing and more study is needed. They determined no single treatment showed what appeared to be a clinically important reduction in joint space width loss.