Create a hyperrealistic anatomical illustration in 4K resolution with a 1:1 proportion, showing three types of knees from a frontal view: normal knee, varus knee (bow-legged), and valgus knee (knock-kneed). Highlight the bones of the pelvis, femur, tibia, and fibula with red lines indicating the mechanical axis as in the reference image. The style should be medical and realistic with detailed anatomical features and a neutral background.emoji