Trajectory of bearing movement during Oxford mobile-bearing unicompartmental knee arthroplasty using a kinematic alignment technique

Abstract

With the knee in full extension and 90° of flexion, we observed the bearing position by marking the A point of the anterior midpoint and B point of the front lateral corner of the bearing trial. [...]the distance of the bearing movement during the knee joint flexion could be calculated, as shown in Figure 1C. The most important finding of this study was that a higher ratio of ideal moving trajectories was observed in the study group with less contiguity of the implants on the anteroposterior knee extension X-ray. [...]we considered that more optimal bearing movement can be achieved with this kinematic alignment technique. [...]the potential rotation and dislocation of the bearing could be reduced. [...]this technique mainly depends on an accurate tibial cut, which is also very important to the bearing trajectory. Funding This work was supported by the grants from the Capital Health Research and Development of Special (No. 2020-24067), the National Natural Science Foundation of China (Nos. 81972130 and 82072494), and Elite Medical Professionals project of China-Japan Friendship Hospital (No.