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Table 2 Rotational alignment of components (median, range) measured from postoperative CT images for alignment groups defined with respect to anatomic landmarks (surgical transepicondylar axis, medial third of the tibial tuberosity) and rotational mismatch between femoral and tibial components

From: Prosthesis alignment affects axial rotation motion after total knee replacement: a prospective in vivo study combining computed tomography and fluoroscopic evaluations

Alignment group n (% total) Rotational alignment (°)
    Femoral component Tibial component Femoral-tibial mismatch
Anatomic Landmarks Nominal 46/67 (69%) 0.6 (−2.8 – 2.7) 0.0 (−6.5 – 9.9) 0.4 (−9.5 – 10.6)
  Outliers 21/67 (31%) 1.2 (−3.4 – 3.8) 12.0 (−14.9 – 26.0) −0.5 (−13.3 – 14.4)
    p = 0.554 p = 0.002 p = 0.846
Rotational Mismatch Nominal 44/67 (66%) 0.6 (−3.4 – 3.8) 0.0 (−13.3 – 26.0) −0.2 (−5.0 – 4.6)
  Outliers 23/67 (34%) 0.9 (−3.1 – 3.5) 0.0 (−14.9 – 20.9) 6.2 (−13.0 – 14.4)
    p = 0.659 p = 0.084 p = 0.146
  1. Positive or negative rotational alignment corresponded to internal or external component alignment, respectively. Positive rotational mismatch corresponded to femoral internal rotation relative to the tibial component and negative rotational mismatch corresponded to femoral external rotation.