310 patients with Kellgren-Lawrence grade II-III knee osteoarthritis were randomized to a single intraarticular injection of either extended release triamcinolone acetonide 16mg (FX006 16mg; Flexion Therapeutics), extended release triamcinolone acetonide 32mg (FX006 32mg; Flexion Therapeutics), or placebo saline. Patients were assessed for the primary outcome measure of pain on a Numeric Rating Scale weekly for 24 weeks, with the primary endpoint at 12 weeks. At the primary endpoint, neither the FX006 16mg group nor the FX006 32mg group demonstrated significantly lower pain scores compared to the placebo group. At secondary endpoints, significantly lower NRS score was noted with FX006 16mg vs placebo for weeks 1-9, and with FX006 32mg vs placebo from weeks 1-11 and week 13. Differences between groups at all subsequent timepoints were not significant.