Abstract
Computer-assisted surgery, particularly the image-free knee navigation system, is clinically useful because the exact mechanical axis of the lower extremity is achievable during total knee arthroplasty (TKA). Moreover, intra-operative kinematic analysis also enables the surgeon to predict the postoperative kinematics. The image-free knee navigation system has advantages including the appropriate implantation of the TKA based on the mechanical axis of lower extremity leading to the maximal expression of design concepts and kinematics. However, there are several issues and pitfalls of the axial decision and kinematic analysis using this system. In this paper, these issues are discussed and the solutions for them are also described from the experience of 871 cases of TKA in our institution.
