Abstract
Purpose
The purpose of the present study is to compare newer designs of various symmetric and asymmetric tibial components and measure tibial bone coverage using the rotational safe zone defined by two commonly utilized anatomic rotational landmarks.
Methods
Computed tomography scans (CT scans) of one hundred consecutive patients scheduled for total knee arthroplasty were obtained pre-operatively. A virtual proximal tibial cut was performed and two commonly used rotational axes were added for each image: the medio-lateral axis (ML-axis) and the medial 1/3 tibial tubercle axis (med-1/3-axis). Different symmetric and asymmetric implant designs were then superimposed in various rotational positions for best cancellous and cortical coverage. The images were imported to a public domain imaging software, and cancellous and cortical bone coverage was computed for each image, with each implant design in various rotational positions.
Results
One single implant type could not be identified that provided the best cortical and cancellous coverage of the tibia, irrespective of using the med-1/3-axis or the ML-axis for rotational alignment. However, it could be confirmed that the best bone coverage was dependent on the selected rotational landmark. Furthermore, improved bone coverage was observed when tibial implant positions were optimized between the two rotational axes.
Conclusions
Tibial coverage is similar for symmetric and asymmetric designs, but depends on the rotational landmark for which the implant is designed. The surgeon has the option to improve tibial coverage by optimizing placement between the two anatomic rotational alignment landmarks, the medial 1/3 and the ML-axis. Surgeons should be careful assessing intraoperative rotational tibial placement using the described anatomic rotational landmarks to optimize tibial bony coverage without compromising patella tracking.
Level of Evidence
III.
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Abbreviations
- TKR:
-
Total knee replacement
- med-1/3-axis:
-
Medial-third-axis
- ML-axis:
-
Medial-lateral-axis
- TPC:
-
Tibial plateau center
- MPC:
-
Medial plateau center
- LPC:
-
Lateral plateau center
- RGB:
-
Red Green Blue
- PCL:
-
Posterior cruciate ligament
- PTA:
-
Posterior tibial axis
- AP:
-
Anteroposterior
- ML:
-
Mediolateral
- MCL:
-
Medio-collateral ligament
- Sym1:
-
Attune
- Sym2:
-
Sigma
- Asym1:
-
Journey
- Asym2:
-
Persona
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MM: acquisition of data, analysis and interpretation of data, drafting of the manuscript, preparing of graphs and tables, has given final approval of the version to be published, participated in the design of the study, agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. JW: revising the manuscript critically for important intellectual content, participated in the design of the study. JC: participated in the design of the study and performed the statistical analysis. JB: revising the manuscript critically for important intellectual content, discussion of background and results, analysis and interpretation of data, have given final approval of the version to be published, agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. WF: provided conception and design of the study, general supervision of the research group, analysis and interpretation of data, discussion of background and results, revising the manuscript critically for important intellectual content, final approval of the version to be published, agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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There was no outside funding or grants received that assisted in this study.
Ethical approval
This study has been performed in accordance with ethical standards concerning investigations in the United States of America.
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Meier, M., Webb, J., Collins, J.E. et al. Do modern total knee replacements improve tibial coverage?. Knee Surg Sports Traumatol Arthrosc 26, 3219–3229 (2018). https://doi.org/10.1007/s00167-018-4836-3
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Keywords
- Total knee arthroplasty
- Tibial coverage
- Rotational alignment
- Total knee replacement
- Tibial rotation