Purpose: Intraoperative local infiltration analgesia has gained increasing popularity in joint replacement surgery. Because there is considerable variation among drug combinations, analgesic effects of each drug are not well understood. The purpose of this study was to clarify the efficacy of the addition of steroid to local anaesthetics in local infiltration analgesia during total knee arthroplasty.
Methods: Forty patients were randomly allocated to the steroid or control group. Patients in the steroid group received peri-articular injection of ropivacaine, dexamethasone and isepamicin, while dexamethasone was omitted from the analgesic mixture in the control group. Primary outcome was pain severity at rest using 100 mm visual analogue scale.
Results: Pain severity in the steroid group was lower than control group and there were significant differences between groups at post-operative day 1 and 3. Reduction in post-operative pain was associated with a decrease in serum C-reactive protein and interleukin 6 in drainage fluid. The number of patients who were able to perform straight leg raise within post-operative day 2 was 15/20 in the steroid group, which was significantly higher than the control group 5/20.
Conclusion: Adding steroid to local anaesthetics in local infiltration analgesia reduced inflammation both locally and systemically, resulting in significant early pain relief and rapid recovery in total knee arthroplasty.
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