Dexa-Ra=low-dose dexamethasone with ramosetron; R=ramosetron alone; VAS=visual analog scale.Reproduced from Koh IJ et al. Preemptive Low-dose Dexamethasone Reduces Postoperative Emesis and Pain After TKA: A Randomized Controlled Study. Clin Orthop Relat Res. 2013;471:3010–3020. With permission from Springer.