To investigate the optimal thresholds and diagnostic efficacy of commonly used serological and synovial fluid detection indexes for diagnosing periprosthetic joint infection (PJI) in patients who have rheumatoid arthritis (RA).

中文翻译：

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类风湿性关节炎患者假体周围关节感染的诊断。

探讨常用血清学和滑液检测指标诊断类风湿性关节炎（RA）假体周围感染（PJI）的最佳阈值和诊断效能。