The knee, a complex hinge joint linking the thigh and leg, is central to human mobility, allowing for flexion, extension, and slight rotation. Anatomically, it includes the femur, tibia, patella, and supporting ligaments, rendering it susceptible to injury and osteoarthritis. Scholars such as Herbert Spencer examined its cultural symbolism, observing how kneeling conveys respect, while Bayard Henderson Christy investigated its biomechanics during walking.
Ely Van de Warker emphasized its sexual dimorphism, and Albert F. Blaisdell outlined its ligamentous contribution to movement. These viewpoints highlight the knee’s dual nature as both a biological structure and a cultural symbol, connecting physical function with human behavior.