Iseki T, Tsukada S, Wakui M, et al. - Researchers examined clinical effectiveness of percutaneous periarticular injection at 1 day after simultaneous bilateral total knee arthroplasty (TKA). This study included 88 knees in 44 patients who had simultaneous bilateral TKA. Participants were randomized to receive a percutaneous periarticular injection at 1 day post-surgery (n = 22 patients) or no injection (n = 22 patients). A solution including methylprednisolone, ropivacaine, and epinephrine was injected into the muscle belly of the vastus medialis at 1 day post-surgery, in the additional injection group. The postoperative pain at rest (primary outcome measure) was assessed using a visual analog scale. Findings revealed that better postoperative pain relief was achieved with additional percutaneous periarticular injection at 1 day post-TKA adding to intraoperative periarticular injection.