Abstract
Introduction
Tibial component design and positioning contribute more to patient satisfaction than previously realized. A surgeon needs to decide on the size and rotation, bearing in mind that coverage should be as high as possible, whilst malrotation and overhang should be avoided. No study investigates the impact of each of these components on clinical outcomes in a single cohort.
Materials and methods
This is a retrospective analysis of 1-year postoperative outcomes measured with the Knee Injury and Osteoarthritis Outcome (KOOS) Score, as well as a previously validated rotational CT protocol. Coverage, rotation from Insall’s axis, and overhang of an asymmetric tibial baseplate were measured, and positive and negative correlations to clinical outcomes were calculated.
Results
A total of 499 knees were analyzed. Patient average age was 68.4 years. Rotation within 7° internal and 5° external from Insall’s axis was a “safe zone”. Mean coverage was 76%. A total of 429 knees (94%) had a coverage of at least 70% and 102 knees (22%) greater than 80%. Overhang was detected in 23% of the cohort. Increased coverage was correlated to increased KOOS score and overhang correlated with a decreased KOOS score (p = 0.008).
Conclusions
This study demonstrates the individual role of three aspects of tibial component implantation properties in postoperative pain and short-term functional outcomes. Upsizing to the point of overhang with rotational tolerance of 7° internal and 3° external to Insall’s axis demonstrates best patient reported outcomes. Overhang decreases the clinical outcome by the same margin as loss of 16% of coverage.
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Antonio Klasan has received research support from Implantcast. Joshua Twiggs is an employee of 360 Knee Systems. Brett Fritsch has been paid for presentations by and is a consultant for Arthrex and Omni. He has stock options in 360 Knee Systems, he has received research support from Arthrex, Smith & Nephew and Zimmer. Brad Miles has Stock Options in 360 Knee Systems. Thomas Heyse has been paid for presentations by Smith & Nephew, Zimmer Biomet and Implantcast, he has received research support from Smith & Nephew, Zimmer Biomet and Implantcast and he is a consultant to Smith & Nephew. Michael Solomon receives royalties from Corin and Medacta, has been paid for presentations and received research support from Corin. David Parker has been paid for presentations by Arthrex and Smith & Nephew, he is a consultant for Arthrex and Global, has stock options in 360 Knee Systems and Trium.
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Klasan, A., Twiggs, J.G., Fritsch, B.A. et al. Correlation of tibial component size and rotation with outcomes after total knee arthroplasty. Arch Orthop Trauma Surg 140, 1819–1824 (2020). https://doi.org/10.1007/s00402-020-03550-z
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DOI: https://doi.org/10.1007/s00402-020-03550-z