Bleeding in TKA: posterior stabilized vs. cruciate retaining

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Total knee arthroplasty (TKA) is a common treatment for end-stage osteoarthritis.
• Posterior-stabilized (PS) and cruciate-retaining (CR) designs are widely used, with selection often based on surgeon preference and patient-specific factors.

Purpose of the Study:

• To compare postoperative blood loss and transfusion requirements between PS and CR TKA.
• To evaluate the impact of TKA design on patient blood management.

Main Methods:

• Retrospective analysis of 473 patients undergoing TKA (240 CR, 233 PS) from a single manufacturer.
• Blood loss calculated using pre- and postoperative hematocrit levels.
• Transfusion requirements were recorded and analyzed using the Mann-Whitney U test.

Main Results:

• Significantly higher calculated blood loss (RBC loss) in the PS group (548 ± 216 ml) compared to the CR group (502 ± 186 ml) (p=0.032).
• No statistically significant difference in transfusion requirements between the PS (0.41) and CR (0.37) groups (p=0.39).

Conclusions:

• PS TKA is associated with greater blood loss, potentially due to femoral bone preparation.
• Despite increased blood loss, PS TKA does not lead to a significantly higher transfusion rate compared to CR TKA.