ALB and infection: Notably, the albumin-to-globulin ratio (AGR) was significantly lower in the infection group (median 1.1, IQR 0.93–1.35) compared with the aseptic group (median 1.5, IQR 1.32–1.7; p < 0.001), supporting its potential role as an adjunctive biomarker in the diagnostic assessment of PJI.