• Chul-Won Ha, Yong-Beom Park, Byung-Woo Min, Seung-Beom Han, Jae Hyup Lee, Ye-Yeon Won, and Ye-Soo Park.
• Department of Orthopedic Surgery, Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul 06351, South Korea; Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, 81 Irwon-ro, Gangnam-gu, Seoul 06351, South Korea.
• J Ethnopharmacol. 2016 Apr 2; 181: 1-7.

Ethnopharmacological RelevanceThis prospective, randomized, double-blinded, double-dummy, multicenter study compared the efficacy and safety of PG201 (Layla®), a new product from extracts of 12 plant sources and SKI306X (Joins®) which have been well investigated and in relatively wide usage among herbal medicine, for the treatment of patients with knee osteoarthritis.Aim Of The StudyTo compare the efficacy and safety of PG201 and SKI306X in patients with knee osteoarthritis.Materials And MethodsA prospective, double-blinded multicenter study was conducted in 124 patients with Kellgren and Lawrence grade 2-3 knee osteoarthritis. Patients were randomly assigned to receive 600mg of PG201 (300mg, twice daily) and 600mg of SKI306X placebo (200mg, thrice daily) or 600mg of SKI306X (200mg, thrice daily) and PG201 placebo (300mg, twice daily) for 12 weeks. The primary outcome was the improvement of pain by week 8 as assessed by the 100-mm pain visual analog scale (VAS). Secondary outcomes included pain VAS improvement level at week 12, pain VAS improvement rate at weeks 8 and 12, the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) improvement level at weeks 8 and 12, the improvement of the quality of life (EQ-5D), overall symptom self-assessment score, and rescue medication consumption.ResultsThe pain VAS improvement at 8 weeks was 14.2±16.2 in the experimental group and 11.9±13.1 in control group (p=0.557), confirming that the experimental group was not inferior to the control group as lower limit (-8.38) of 95% CI of the difference of VAS improvement between two groups was well above the allowed limit (-10 mm). There was no significant difference in all secondary outcomes including pain VAS, WOMAC, EQ-5D, overall symptom self-assessment score, and rescue medication consumption. Adverse events were low and similar between the two groups.ConclusionsThe results of this study showed that PG201 significantly reduced knee pain and improved knee function and were comparable to SKI306X. PG201 can be suggested as an effective treatment of knee osteoarthritis. Trial registration ClinicalTrials.gov:NCT01768468.Copyright © 2016 Elsevier Ireland Ltd. All rights reserved.

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