Abstract
Purpose
The aim of this study was to test the hypothesis that the medial constrained insert would reproduce the native knee kinematics after bicruciate-retaining (BCR) total knee arthroplasty (TKA).
Methods
Using an image-free navigation system in six fresh-frozen whole-body cadavers, the rotation angle of the tibia at minimum flexion, at 10° intervals from 0° to 130° flexion, and at maximum flexion during manual passive knee flexion was assessed. The data was collected in native knees, in BCR TKA using a normal flat insert (BCR-XP), and in BCR TKA using a more constrained insert in the medial side (BCR-AS). The differences in the rotation angle of the tibia were statistically evaluated.
Results
The rotation angles of the tibia in BCR-XP were significantly different from those of the native knees both in the early flexion phase (p = 0.002 at minimum knee flexion, p = 0.002 at 0°, p = 0.041 at 10°, p = 0.009 at 20°, p = 0.026 at 30°) and in the late flexion phase (p = 0.015 at 130°, p = 0.015 at maximum knee flexion), whereas the rotational angles of the tibia in BCR-AS were similar to those of the native knee.
Conclusion
This study shows that the rotational kinematics of the native knee is reproduced after BCR TKA with the medial constrained insert. Surgeons and implant designers should be aware that constraint of the medial side in BCR TKA is a crucial factor for restoration of native kinematics which may lead to better clinical outcome.
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Abbreviations
- TKA:
-
Total knee arthroplasty
- UKA:
-
Unicompartmental arthroplasty
- ACL:
-
Anterior cruciate ligament
- PCL:
-
Posterior cruciate ligament
- BCR:
-
Bicruciate-retaining
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Funding
This study was funded by the Grant of The Japanese Orthopaedic Society of Knee, Arthroscopy and Sports Medicine, 2016.
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Contributions
KW carried out the kinematic measurements, performed the statistical analysis, and drafted the manuscript. DH participated in the design of the study and performed the TKA surgery as the surgeon. TT and AN assisted in performing the TKA surgery and kinematic measurements. IT and YT coordinated this study. TG and KS helped to draft the manuscript. All authors read and approved the final manuscript.
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Conflict of interest
This study received grant from Grant of The Japanese Orthopaedic Society of Knee, Arthroscopy and Sports Medicine, 2016.
Ethical approval
This study was approved by the institutional review board (IRB) of Tokushima University Hospital (approval no. 2068), and was performed in accordance with the 1964 Helsinki Declaration and its later amendments.
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Wada, K., Hamada, D., Takasago, T. et al. The medial constrained insert restores native knee rotational kinematics after bicruciate-retaining total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 27, 1621–1627 (2019). https://doi.org/10.1007/s00167-018-5249-z
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DOI: https://doi.org/10.1007/s00167-018-5249-z