Blood loss in sequential bilateral total knee arthroplasty

Area of Science:

• Orthopedic Surgery
• Hematology

Background:

• Sequential bilateral knee arthroplasty involves two total knee replacement surgeries on the same patient.
• Understanding blood loss patterns is critical for patient safety and surgical planning.

Purpose of the Study:

• To compare blood loss between the first and second knees in sequential bilateral knee arthroplasty.
• To investigate potential hematological changes influencing blood loss.

Main Methods:

• A comparative study involving 28 patients undergoing sequential bilateral knee arthroplasty and a control group undergoing unilateral knee arthroplasty.
• Measurement of intraoperative and postoperative blood loss.
• Analysis of clotting parameters including prothrombin time, activated partial thromboplastin time, and thrombin time.

Main Results:

• Greater blood loss was observed in the second knee compared to the first, with a mean difference of 323 mL (P < .05).
• No significant difference in blood loss was found between the first knee and the unilateral control group.
• Prolongation of prothrombin time, activated partial thromboplastin time, and thrombin time was noted after the release of the first tourniquet.

Conclusions:

• The second knee in sequential bilateral arthroplasty experiences significantly more blood loss than the first.
• Changes in clotting times may contribute to increased bleeding after the initial tourniquet release.
• These findings necessitate careful blood management strategies for the second stage of bilateral knee replacement.