Adding corticosteroids to periarticular infiltration analgesia improves the short-term analgesic effects after total knee arthroplasty: a prospective, double-blind, randomized controlled trial

Purpose Periarticular infiltration analgesia (PIA) is widely used to control postoperative pain in patients who underwent total knee arthroplasty (TKA). This study aimed to evaluate the efficacy of adding corticosteroids to the PIA cocktail for pain management in patients who underwent TKA. Methods The patients were randomized to the corticosteroid or control group (double-blind). The patients in the corticosteroid group received a periarticular infiltration of an analgesic cocktail of ropivacaine, epinephrine, and dexamethasone. Dexamethasone was omitted from the cocktail in the control group. The primary outcomes were postoperative pain [assessed using a visual analog scale (VAS)], time until the administration of first rescue analgesia, morphine consumption, and postoperative inflammatory biomarkers [C-reactive protein (CRP) and interleukin-6 (IL-6)]. The secondary outcomes were functional recovery, assessed by the range of knee motion, quadriceps strength, and daily ambulation distance. The tertiary outcomes included postoperative adverse effects. Results The patients in the corticosteroid group had significantly lower resting VAS scores at 6 and 12 h after surgery, lower VAS scores during motion up to 24 h after surgery, and lower levels of inflammatory biomarkers. All the differences in the VAS scores between the two groups did not reach the point to be considered clinically significant. The additional use of corticosteroid significantly prolonged analgesic effects and led to lower rescue morphine consumption. The patients in the corticosteroid group had significantly better functional recovery on the first day after surgery. The two groups had a similar occurrence of adverse effects. Conclusions Adding corticosteroids to an analgesic cocktail for PIA could lightly improve early pain relief and accelerate recovery in the first 24 h after TKA.