Partial knee arthroplasty theoretically produces less blood loss compared to total knee arthroplasty (TKA) due to a lesser invasive procedure. Medial unicompartmental knee arthroplasty (UKA) is the most common partial knee arthroplasty performed due used due to the most commonly impacted medial knee. This study compared the postoperative drainage volume and length of stay (LOS) of TKA vs UKA and evaluated its comparison with patient characteristics.

Theoretically, UKA will produce less blood loss due to a shorter skin incision, quadriceps sparing muscle approach, persistence of cruciate ligaments, and less femorotibial dislocation.7 However, studies investigating drainage volume in UKA are still limited. In this study, we compared the drainage volume of patients undergoing TKA vs UKA and evaluated several parameters that contributed the production. This study has not received any funding or grant.

Inclusion Criteria:

• grade 4 Osteoarthritis

Exclusion Criteria:

• previous trauma
• infection
• blood coagulation disorder

medical records of patients who underwent primary TKA and UKA between December 2019 and October 2022