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Safety and efficacy of US-approved viscosupplements for knee osteoarthritis: a systematic review and meta-analysis of randomized, saline-controlled trials

Authors Strand V, McIntyre L, Beach W, Miller LE, Block J

Received 18 February 2015

Accepted for publication 22 March 2015

Published 7 May 2015 Volume 2015:8 Pages 217—228

DOI https://doi.org/10.2147/JPR.S83076

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Editor who approved publication: Dr Michael Schatman

Vibeke Strand,1 Louis F McIntyre,2 William R Beach,3 Larry E Miller,4,5 Jon E Block5

1Stanford University School of Medicine, Palo Alto, CA, USA; 2New York University Medical Center, White Plains, NY, USA; 3Tuckahoe Orthopaedics, Richmond, VA, USA; 4Miller Scientific Consulting, Inc., Asheville, NC, USA; 5The Jon Block Group, San Francisco, CA, USA

Background: Intra-articular injection of hyaluronic acid is a common, yet controversial, therapeutic option for patients with knee osteoarthritis (OA). The purpose of this research was to determine the safety and efficacy of US-approved viscosupplements for symptomatic knee OA.
Methods: We searched MedLine and EMBase for randomized, sham-controlled trials evaluating safety and/or clinical efficacy of US-approved viscosupplements in patients with symptomatic knee OA. Knee pain severity and knee joint function were assessed at 4 to 13 weeks and 14 to 26 weeks. Safety outcomes included serious adverse events, treatment-related serious adverse events, patient withdrawal, and adverse event-related patient withdrawal occurring at any time during follow-up.
Results: A total of 29 studies representing 4,866 unique patients (active: 2,673, control: 2,193) were included. All sham-controlled trials used saline injections as a control. Viscosupplementation resulted in very large treatment effects between 4 and 26 weeks for knee pain and function compared to preinjection values, with standardized mean difference values ranging from 1.07 to 1.37 (all P<0.001). Compared to controls, standardized mean difference with viscosupplementation ranged from 0.38 to 0.43 for knee pain and 0.32 to 0.34 for knee function (all P<0.001). There were no statistically significant differences between viscosupplementation and controls for any safety outcome, with absolute risk differences of 0.7% (95% confidence interval [CI]: –0.2 to 1.5%) for serious adverse events, 0% (95% CI: –0.4 to 0.4%) for treatment-related serious adverse events, 0% (95% CI: –1.6 to 1.6%) for patient withdrawal, and 0.2% (95% CI: –0.4 to 0.8%) for adverse event-related patient withdrawal.
Conclusion: Intra-articular injection of US-approved viscosupplements is safe and efficacious through 26 weeks in patients with symptomatic knee OA.

Keywords: hyaluronic acid, intra-articular, viscosupplementation

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