Abstract
BACKGROUND: The purpose of this study was to investigate the efficacy and safety of multiple low-dose dexamethasones in primary total knee arthroplasty (TKA). METHODS: One hundred fifty patients were equally randomized into 3 groups: Group A (n = 50) received 2 doses of normal saline only; Group B (n = 50) received with 1 dose of intravenous dexamethasone and 1 dose of normal saline; Group C (n = 50) received with 2 doses of intravenous dexamethasone. The clinical outcomes and complications were assessed. RESULTS: The CRP and IL-6 were significantly lower in Group C and B than Group A at 24, 48, and 72 h postoperatively (P < 0.001 for all). The intensity of postoperative nausea and vomiting (PONV) in Group C was lower than Group A at 24 (P < 0.001, P = 0.002), 48 (P = 0.005, P = 0.041) and 72 h (P = 0.017, P = 0.031) postoperatively and Group B at 24 h (P = 0.027, P = 0.019) postoperatively. Pain were significantly less in Group C than Group A at 24 (P < 0.001), 48 h (P = 0.037) postoperatively and Group B 24 h (P = 0.030) postoperatively. Patients in Group C had better range of motion (ROM) and satisfaction than Group A (P < 0.001, P = 0.002) and B (P = 0.001, P = 0.043). No differences were found in complications. CONCLUSIONS: The administration of 10 mg dexamethasone 1 h before the surgery, and repeated at 6 h postoperatively can significantly reduce the level of postoperative CRP and IL-6 and the incidence of PONV, relieve pain, achieve an additional analgesic effect, and improve the early ROM compared with the other two groups in TKA. LEVEL OF EVIDENCE: Therapeutic Level I. TRIAL REGISTRATION: The Chinese Clinical Trial Registry ( ChiCTR1800017036 ). Registered on July 9, 2018.