The aim of this study was to identify, during total knee arthroplasty surgery, the effect on patellar kinematics of different patellar component designs in the same patients.
This study enrolled 84 patients with osteoarthritis. Intraoperative X-rays were used to measure internal rotation angle, flexion angle and lateral tilt were at different knee flexion angles with dome-type or anatomic-type patellar components (ATTUNE
Significant differences from baseline between the two types of components occurred at 120° of the knee flexion in the internal rotation angle, at 90° and 120° of the knee flexion in the flexion angle, and at 60° of the knee flexion in the lateral tilt.
This study revealed that the difference in patellar component design affects patellar kinematics. Therefore, the difference in patellar component design may affect patellar stability.