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Association between femoral component rotation and function.
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Association between tibial component rotation and function.
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WOMAC and Oxford Knee Score determined function.
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High function after kinematic aligned total knee arthroplasty.
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Weak association between component rotation bounded by the ranges reported in the present study and function.
Does Malrotation of the Tibial and Femoral Components Compromise Function in Kinematically Aligned Total Knee Arthroplasty?
Section snippets
Key points
Methods
An institutional review board approved the analyses of 101 consecutive patients (101 knees) treated with a primary kinematically aligned TKA from June to September, 2012, by an inventor surgeon (S.M.H.) who were prospectively followed for 6 months. When feasible, patients were scheduled for a preoperative MRI scan to evaluate cartilage wear and plan the thickness of the posterior resections from the femur. Thirty patients were excluded because they were unable to have our protocol preoperative
Results
The ICC of 0.91 for the measurement of I-E malrotation of the femoral component and the ICC of 0.97 for the measurement of I-E malrotation of the tibial component indicated high (first class) measurement reproducibility.
The best achievable OKS is 48 (range 0–48), and the mean patient-reported OKS was 42 ± 4.5 (95% CI, 41.2 to 43.4). The best achievable WOMAC score is 100 (range 0–100), and the mean WOMAC score was 89 ± 9.7 (95% CI, 86.7–91.3).
The I-E malrotation of the A-P axis of the femoral
Discussion
The most important findings in this case series of 71 patients treated with a kinematically aligned, cruciate-retaining TKA were that the range of I-E malrotation of the tibial component was 4 times greater than the range of I-E malrotation of the femoral component, and that the range of I-E malrotation of the femoral component from −3° internal to 2° external and the range of I-E malrotation of the tibial component from −11° internal to 12° external were not associated with compromised
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Disclosures: The authors have not received grant support or research funding and do not have any proprietary interests in the materials described in the article.