In this atlas anatomical slices of the knee region are studied in the three fundamental spatial planes: frontal, sagittal, and horizontal; furthermore the corresponding views obtained by computed tomography of the same anatomical specimens, the equivalent horizontal CT views of the knee region alive and magnetic resonance images of the knee alive observed at the same levels in the same spatial planes are depicted. This method allows identification of all articular and periarticular structures and reveals their shape, position, and principal relations. The precision with which the anatomical slices are analyzed facilitates comparison with pathological material and with images using methods other than those employed here, such as echography.