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The molecular weight of therapeutic hyaluronan (sodium hyaluronate) : how significant is it?

Aviad, A.D.; Houpt, J.B.

Journal of Rheumatology 21(2): 297-301

1994

ISSN/ISBN: 0315-162X
PMID: 8182640
Document Number: 438672
Various molecular weight hyaluronic acid (HA) preparations have been injected into joints for the treatment of human and equine osteoarthritis. A therapeutic advantage has been claimed for commercial products with a molecular weight in the range found in normal synovial fluid (SF), compared to lower molecular weight products. But a correlation between molecular weight and efficacy is not borne out by an analysis of the available literature on clinical results, SF viscosity, HA concentration, HA molecular weight and rate of synthesis in joint disease. It is proposed that the beneficial effect of injected HA in joint disease may be due to pharmacological rather than to physical properties.

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