ALB and atrial fibrillation: This study aims to evaluate the value of the albumin-to-globulin ratio (AGR) in synovial fluid (SF) for diagnosing PJI and compare its diagnostic performance with traditional biomarkers such as serum C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), synovial fluid polymorphonuclear percentage (SF-PMN%), and the potential marker serum albumin-to-globulin ratio (SE-AGR).<h4>Methods</h4>This prospective study enrolled 230 patients who experienced pain following total hip or total knee arthroplasty, including 97 cases of PJI and 133 cases of aseptic failure(AF).