Huang J, et al. – This study was carried out to determine the incidence of postoperative delirium undergoing total knee arthroplasty (TKA) in Asians. Collected data showed that the incidence of postoperative delirium in Asians undergoing TKA was very low at 0.59%. Factors like advanced age, lower body mass index, Chinese ethnicity, male gender and preoperative chronic opioid use might be associated with developing postoperative delirium.