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

Background

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.

Methods

This was a retrospective case-control study recruited from two centres. Measured outcomes include kinematics analysis, proprioception, and functional outcomes.

Results

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.

Conclusion

BCR TKA demonstrated better knee flexion in weight-bearing active range of motion and shows similarities with normal knee kinematics.