The main purposes of this study were to compare the efficacy and safety of adding intra-articular dexmedetomidine as an adjunct to local anesthetics for knee arthroscopy. A systematic literature review was conducted to search for randomized controlled trials (RCTs) published from database inception to November 11, 2023, comparing intra-articular dexmedetomidine combined with local anesthetics to intra-articular anesthetics alone. The primary outcome was the time to the first rescue analgesic administration. Secondary outcomes included rescue analgesic dosage, postoperative pain scores at rest and during movement within 24 h, patient satisfaction, and adverse effects. In total, 24 eligible RCTs comprising 1289 participants were included. Compared to local anesthetics alone, intra-articular dexmedetomidine combined with local anesthetics resulted in a significantly prolonged time to the first rescue analgesic (MD: 249.44 min, 95 % CI: [178.73, 320.16]). The rescue analgesic dosage and postoperative pain score at rest and during movement within 24 h were also significantly decreased in the intra-articular dexmedetomidine group. Patient satisfaction was significantly higher in the intra-articular dexmedetomidine group than in the control group. Adverse effects, including hypotension and bradycardia, are rare. However, the long-term effects of intra-articular dexmedetomidine were not investigated in the included RCTs.
Adding intra-articular dexmedetomidine as an adjunct to local anesthetics prolongs the time to the first rescue analgesic and decreases the postoperative pain score compared to local anesthetics alone without increasing short-term side effects in knee arthroscopy.
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