Abstract: Objective: To clarify the clinical efficacy of platelet-rich plasma (PRP) in the treatment of patients with refractory knee osteoarthritis (KOA) combined with infection. Methods: Between June 2014 and June 2016, 60 refractory KOA patients with infection (non-pyogenic infection) admitted to Ningbo NO.6 Hospital were recruited in this study. The patients were randomly assigned to receive either PRP plus antibiotics (A group, n=30) or sodium hyaluronate and antibiotics (B group, n=30). The Visual Analogue Scale (VAS) and Lysholm Knee Scale scores of the patients in both groups were documented and compared before treatment, at 1 mon and 3 mon after treatment, respectively.