Impact of enhanced recovery after surgery on postoperative blood management following primary total knee arthroplasty: a propensity score-matched analysis

To evaluate the efficacy of blood management in patients underwent unilateral Total Knee Arthroplasty (TKA) under an enhanced recovery after surgery (ERAS) program.

Patients underwent unilateral TKA from January 2019 to October 2023 in a university hospital were retrospectively studied. A total of 200 cases were selected in the analysis. After matching with propensity scoring, 51 patients in each group were included. The postoperative Haemoglobin (Hb), albumin (Alb), C-reactive protein (CRP), total length of stay (LOS), and estimated blood loss after operation were compared between the two groups. Clinical outcomes including Western Ontario and McMaster Universities Arthritis Index (WOMAC), SF-12, and Oxford Knee Score (OKS) were also compared at six week and three month follow-up.

The results showed that the Hb of the ERAS group was significantly higher than those of the non-ERAS group (P < 0.05) on the third postoperative. The mean CRP level was lower, LOS was shorter, and Alb level was higher in the ERAS group compared to that in the non-ERAS group (P < 0.05). The clinical outcomes such as WOMAC and OKS, SF-12 scores were higher in the ERAS group at both follow-up.

ERAS protocol effectively minimizes perioperative blood loss and supports optimal nutrient levels in patients. ERAS management significantly contributes to the postoperative recovery of knee function in patients undergoing primary total knee arthroplasty.