In the Original Investigation titled “Drug-Free Interventions to Reduce Pain or Opioid Consumption After Total Knee Arthroplasty: A Systematic Review and Meta-analysis,”¹ published online August 16, 2017, there was an error in the Abstract. In Data Extraction and Synthesis, the sentence “Two reviewers independently extracted the data from selected articles using a standardized form and assessed the risk of bias” should have specified “Three reviewers.” This article was corrected online.

中文翻译：

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摘要错误

^{在 2017 年 8 月16}日在线发表的题为“无药物干预以减少全膝关节置换术后疼痛或阿片类药物消耗：系统评价和荟萃分析”的原始调查中，摘要中有一个错误。在数据提取和综合中，“两名审稿人使用标准化表格独立提取所选文章的数据并评估偏倚风险”这句话应该指定“三名审稿人”。这篇文章在线更正。