Comparison of the in vivo kinematics between robotic-assisted Bi-cruciate retaining and Bi-cruciate stabilized total knee arthroplasty

<p><strong>Background</strong></p> <p>Up to 20% of patients remain unsatisfied after total knee arthroplasty (TKA), prompting the development of new implants. Bi-Cruciate Retaining (BCR) TKA preserves both the ACL and PCL, with the ACL beneficial for its proprioceptive qualities1. The Bi-Cruciate Stabilized (BCS) TKA substitutes the ACL and PCL with a unique dual cam-post mechanism. Robotics improve accuracy and facilitate technically demanding TKA2.</p> <p><strong>Methods</strong></p> <p>This was a retrospective case-control study recruited from two centres. Measured outcomes include kinematics analysis, proprioception, and functional outcomes.</p> <p><strong>Results</strong></p> <p>There was a significantly larger maximum flexion angle and range of flexion to extension in sit-to-stand and stairs in BCR when compared to BCS. Further analysis revealed more similarities between BCR and normal native knees. Proprioception and functional scores didn’t have any statistical difference.</p> <p><strong>Conclusion</strong></p> <p>BCR TKA demonstrated better knee flexion in weight-bearing active range of motion and shows similarities with normal knee kinematics.</p>