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Published in: BioDrugs 4/2012

01-08-2012 | Systematic Review

Hyaluronic Acid in the Treatment of Knee Osteoarthritis

A Systematic Review and Meta-Analysis with Emphasis on the Efficacy of Different Products

Authors: Dr Sascha Colen, Michel P. J. van den Bekerom, Michiel Mulier, Daniël Haverkamp

Published in: BioDrugs | Issue 4/2012

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Abstract

Background: Although accepted as a conservative treatment option for knee osteoarthritis, the debate about the effectiveness of intra-articular treatment with hyaluronic acid (HA) is still ongoing because of contrasting outcomes in different clinical studies. Several well designed clinical studies showed a significant improvement in pain at follow-up compared with baseline but no significant improvement comparing the efficacy of HA with placebo (saline) or with other conservative treatment options. Notwithstanding the effectiveness of different types of intra-articular HA products, the question of whether one HA product is better than another is still unanswered. In this systematic review we compare the effects of intra-articularly administered HA with intra-articularly administered placebo in general and, more specifically, the effects of individual HA products with placebo. We also compare the efficacy of different HA products.
Methods: A systematic review of randomized controlled trials (RCTs) was conducted using databases including MEDLINE, Cochrane Database of Systematic Reviews, Cochrane Clinical Trial Register and EMBASE.
Results: Seventy-four RCTs were included in this systematic review. HA improves pain by approximately 40–50% compared with baseline levels. However, when compared with saline the difference in efficacy is not that large. Due to a large ‘placebo effect’ of saline (approximately 30% pain reduction, persisting for at least 3 months) we determined a weighted mean difference between the efficacy of HA and saline of just 10.20 using the visual analog scale for pain. It is debatable whether this difference reaches the minimum clinically important difference. Comparing the different HA products, which vary in the molecular weight, concentration, and volume of HA, we were not able to conclude that one brand has a better efficacy than another due to the heterogeneity of the studies and outcomes.
Discussion: In the future it will be important to determine the exact mechanism of action of placebo as this may give us an idea of how to treat osteoarthritis more efficiently. Due to the limitations of this review (follow-up of just 3 months and large heterogeneity of the included studies), it is also important to compare the different HA products to determine which product(s), or which molecular weight range, concentration, or volume of HA is the best option to treat osteoarthritis. Our recommendation is to start large (multicenter) RCTs to give us more evidence about the efficacy of the different HA products.
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Metadata
Title
Hyaluronic Acid in the Treatment of Knee Osteoarthritis
A Systematic Review and Meta-Analysis with Emphasis on the Efficacy of Different Products
Authors
Dr Sascha Colen
Michel P. J. van den Bekerom
Michiel Mulier
Daniël Haverkamp
Publication date
01-08-2012
Publisher
Springer International Publishing
Published in
BioDrugs / Issue 4/2012
Print ISSN: 1173-8804
Electronic ISSN: 1179-190X
DOI
https://doi.org/10.1007/BF03261884

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