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Sagittal alignment of the femoral component and patient height are associated to persisting flexion contracture after primary total knee arthroplasty

Journal of Arthroplasty Mar 06, 2019

Okamoto Y, et al. - In this retrospective case-control study, the authors examined 120 knees to evaluate the risk factors linked to continuing flexion contracture after total knee arthroplasty (TKA). Using logistic regression analysis, they observed the relationship between a flexion contracture >10°, 2 years after surgery, and the following potential risk factors: age, body height, body mass index, pre-operative knee extension, and hip-knee-ankle angle, and radiological parameters of component alignment, specifically the femoral component medial angle (FMA), the femoral component flexion angle (FFA), the tibial component medial angle (TMA), and the posterior tibial slope (PTS). They recognized a persisting flexion contracture >10° in 28% of cases. With a contracture of ≤10°, they reported the mean FFA in such cases, 7.3° as compared to 4.2° for cases. They concluded an association between the flexed position of the femoral component and increased the occurrence of persistent flexion contracture especially in subjects of short stature.
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