Fig. 2
From: Factors that impact the patellofemoral contact stress in the TKA: a review
Effect of rotation of the femoral component on the patellofemoral stress. A A neutral or external rotation of the femoral component produces a lower stress especially on the lateral part of patellofemoral joint. B The center of the contact force shifts laterally with the lateral pressure increasing due to the internal malrotation of the femoral component