Fig. 3
From: The morphology of the femoral posterior condyle affects the external rotation of the femur
Geometric center axis (GCA), surgical epicondylar axis (SEA), and posterior condylar axis (PCA) in the axial (xy) plane of the femur. The spherical and posterior condylar angles were measured in the axial (xy) plane. The spherical condylar angle was deemed positive when the GCA was rotated externally more than the PCA. The posterior condylar angle was deemed positive when the SEA was rotated externally more than the PCA