CT-based navigation for total knee arthroplasty

Abstract

Image-free computer-assisted surgery systems have been used worldwide for total knee arthroplasty (TKA). We present a computed tomography (CT)-based system that provides preoperative images. Although there is additional cost for preoperative CT-based navigation, it provides useful kinematic data to surgeons for preoperative planning and in the operating room without imageless navigation. In addition to rotation, varus/valgus instability, and anteroposterior translation data, a recent CT-based navigation system provides information about changes in the lengths of the cruciate ligaments during all ranges of movement. Our preliminary results suggest that intraoperative knee kinematics can predict postoperative in vivo kinematics. Reconstructed knee kinematics is one of the key issues for improving patients' satisfaction after TKA. The CT-based navigation system also supports the surgical procedure by optimizing soft tissue balance, with good clinical results.