Discussion
blood loss, TKA
BLOOD LOSS, CAVITY
In the common practice, the goal of TKA procedure is to restore the MA of the lower limb. Deviation of the MA of the limb away from neutral alignment causes increased force on the concave side of the knee and increases wear rate of the polyethylene insert [TKA using navigation system has some potential benefits from preservation of the medullary cavity of femur, such as less perioperative blood loss [Another advantage of CAS is reducing systemic emboli phenomena in TKA due to avoiding invasion into intramedullary canal [There were some limitations in our study. First, the preoperative FBA was more significant in convention group (4.1°) than navigation group (2.6°), and the difference may affect the postoperative MA of lower limb. Second, although the pinless navigation CAS has less outliers of MA than convention group, the difference had no statistically significant. A larger number of patients in each arm may be necessary to show a significant difference.