Fig. 1From: The morphology of the femoral posterior condyle affects the external rotation of the femurSurgical epicondylar axis (SEA) and the geometric center axis (GCA). The SEA was constructed using the peak point of the lateral epicondyle and the fossa between the anterior peak and the posterior peak on the medial epicondyle. The GCA is the line connecting the centers of the spheres representing the medial and lateral femoral posterior condylesBack to article page