| Summary: | Introduction: The efficacy of intra-articular fentanyl supplementation for pain control after knee arthroscopy remains controversial. We conduct a systematic review and meta-analysis to explore the influence of intra-articular fentanyl supplementation for pain intensity after arthroscopic knee surgery. Methods: We searched PubMed, EMbase, Web of Science, EBSCO, and Cochrane Library databases through May 2019 for randomized controlled trials (RCTs) assessing the efficacy and safety of intra-articular fentanyl supplementation for arthroscopic knee surgery. This meta-analysis is performed using the random-effects model. Results: Four RCTs are included in the meta-analysis. Overall, compared with control group after knee arthroscopy, intra-articular fentanyl supplementation is associated with reduced pain scores at 1 h (standard mean difference (Std MD) = −3.50; 95% confidence interval (CI) = −5.68 to −1.32; p = 0.002), 2 h (Std MD = −4.73; 95% CI = −8.75 to −0.71; p = 0.02), and 8 h (Std MD = −5.02; 95% CI = −9.73 to −0.30; p = 0.04) but shows no substantial impact on pain scores at 4 h (Std MD = −3.94; 95% CI = −7.93 to 0.05; p = 0.05) or the supplementary analgesia (risk ratio = 0.56; 95% CI = 0.09–3.59; p = 0.54). Conclusions: Intra-articular fentanyl supplementation does benefit in pain control after knee arthroscopy.
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