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Correction Cohen M, Wolfe R, Mai T, Lewis D. A randomized, double blind, placebo controlled trial of a topical cream containing glucosamine sulfate, chondroitin sulfate, and camphor for osteoarthritis of the knee. J Rheumatol 2003;31:523-8. On page 524, under the heading, "Interventions," the first sentence should correctly read as follows: "The glucosamine/chondroitin preparation was a water-soluble cream containing glucosamine sulfate (3.0 mg/g), chondroitin sulfate (7.2 mg/g), and shark cartilage (14 mg/g), of which 10% to 30% is chondroitin sulfate, camphor (32 mg/g), and scented with peppermint oil (9 mg/g)." Furthermore, in paragraph 2 of the Discussion, page 526, sentences 2 and 3 should correctly read as follows: "Based on a total usage of 5.5 tubes and an average usage of around 2.5 applications per day, it is estimated that the topical dosages applied in this study were roughly 30 mg of glucosamine sulfate and 78 mg chondroitin sulfate per day. If transdermal absorption is between 20 and 40%, it is estimated that between 6 and 12 mg of glucosamine sulfate and 16 to 30 mg of chondroitin sulfate is delivered through topical application." We regret the error. |