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Therapeutic Effects of Hyaluronic Acid on Osteoarthritis of the Knee

A Meta-Analysis of Randomized Controlled Trials

¹ Department of Orthopedics (C.-T.W., J.L., and S.-M.H.), Department of Medical Research (C.-J.C.), and Department of Pediatrics (Y.-T.L.), National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung-Shan South Road, Taipei, Taiwan. E-mail address for S.-M. Hou: shengmou{at}ha.mc.ntu.edu.tw

Investigation performed at the National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan

In support of their research or preparation of this manuscript, one or more of the authors received a grant (DOH89-NH-058) from the Bureau of National Health Insurance, Taiwan. None of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

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Methods: We conducted a meta-analysis of twenty blinded randomized controlled trials that compared the therapeutic effect of intra-articular injection of hyaluronic acid with that of intra-articular injection of a placebo to treat osteoarthritis of the knee. The outcome end points were classified into three categories: pain with activities, pain without activities, and function. The outcome measures of the efficacy of hyaluronic acid were the mean differences in the efficacy scores between the hyaluronic acid and placebo groups. The outcome measure of the safety of hyaluronic acid was the relative risk of adverse events.

Results: Intra-articular injection of hyaluronic acid can decrease symptoms of osteoarthritis of the knee. We found significant improvements in pain and functional outcomes with few adverse events. However, there was significant between-study heterogeneity in the estimates of the efficacy of hyaluronic acid. Subgroup analysis and meta-regression analysis showed that lower methodological quality such as a single-blind or single-center design resulted in higher estimates of hyaluronic acid efficacy, that introduction of acetaminophen as an escape analgesic in the trial resulted in lower estimates of hyaluronic acid efficacy, and that patients older than sixty-five years of age and those with the most advanced radiographic stage of osteoarthritis (complete loss of the joint space) were less likely to benefit from intra-articular injection of hyaluronic acid.

Conclusions: This meta-analysis confirmed the therapeutic efficacy and safety of intra-articular injection of hyaluronic acid for the treatment of osteoarthritis of the knee. Additional well-designed randomized controlled trials with high methodological quality are needed to resolve the continued uncertainty about the therapeutic effects of different types of hyaluronic acid products on osteoarthritis of the knee in various clinical situations and patient populations.

Level of Evidence: Therapeutic study, Level II-3b (systematic review; nonhomogeneous Level-I studies). See Instructions to Authors for a complete description of levels of evidence.

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Therapeutic Effects of Hyaluronic Acid on Osteoarthritis of the Knee • S.-M. Hou and C.-T. Wang reply:

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