40 patients with knee osteoarthritis were randomized to receive intra-articular triamcinolone injection followed by a 5ml intra-articular injection of autologous conditioned serum (ACS) (n=20) or a saline placebo (n=20). Outcomes of interest included pain on a Numeric Rating Scale (NRS), Knee Injury and Osteoarthritis Scale (KOOS), and the incidence of serious adverse events. Average, maximum, and...