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. 2014 Sep 5;85(5):480–487. doi: 10.3109/17453674.2014.940573

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Copyright: © Nordic Orthopaedic Federation

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Figure 1. — Example of measurements of femoral and tibial TKA component placement in the coronal plane with respect to the femoral and tibial anatomical axes, respectively, according to Petersen and Engh (1988) and as used by e.g. Ritter et al. (2011). Placement of the femoral component is measured using the angle (α) between the line across the bottom of the femoral condyles and femoral shaft axis. α = 90 corresponds to neutral placement, α > 90 corresponds to valgus placement of the femoral component, and α < 90 corresponds to varus placement of the femoral component. Placement of the tibial component is measured using the angle (β) between the line across the base of the tibial plate and the tibial shaft axis. β = 90 corresponds to neutral placement, β > 90 corresponds to valgus placement of the tibial component, and β < 90 corresponds to varus placement of the tibial component. TFA stands for tibiofemoral axis, measured at the angle between the tibial and femoral shaft axes (TFA angle). TFA angle = 180 corresponds to neutral alignment, TFA angle > 180 correponds to TFA in valgus, and TFA angle < 180 corresponds to TFA in varus.