Gu A, Chen AZ, Selemon NA, et al. - In this study, the impact of anemia severity on 30-day postoperative complications following revision hip and knee arthroplasty was ascertained. Researchers performed a retrospective cohort study applying the American College of Surgeons National Quality Improvement Program Database. Between 2006 to 2017, all patients who had undergone revision joint arthroplasty (rTJA) were distinguished and grouped based upon the hematocrit (Hct) level. For analysis, 8,932 patients undergoing rTHA, and 13,313 patients undergoing rTKA were recruited. The results of this study demonstrate that elevating the severity of anemia was correlated with increasing risk of developing any postoperative complication and death following revision hip and knee arthroplasty. A significant trend was observed between diminishing preoperative hematocrit levels and increasing odds of postoperative complication.