Cohen DA, et al. - In this large magnetic resonance imaging (MRI)-based study, researchers evaluated the data to analyze the association between the posterior condylar axis (PCA) and epicondylar axis (EA) with varying coronal deformity, especially with increasing valgus deformity. They noted statistically greater external rotation of the EA from the PCA with a mean of 2.52° (range − 1.9° to 6°) in the valgus group vs the varus group with a mean of 2.03° (range − 3.9° to 6.9°). they found no significant change in the association with increasing severity of coronal malalignment. In large proportion cases, they suggested significant femoral component malrotation in valgus knees with external rotation beyond 3° from PCA.