Landmarks of the knee joint of the lateral radiograph during rotation.

On specimens of human knee joints a study was made of the contours on the lateral radiograph during rotation up to 45 degrees inwards and outwards. The most important characteristics of the femoral condyles are the situation of the limiting groove on the condylar joint surface. The best for identifying the tibial condyles is the lateral intercondylar tubercle which proceeds backwards in an even, convex arch continuing direct in the posterior contour of the lateral tibial condyle.