I have dissected many human knee joints and also many animal knee joints to analyze the morphology and function of the cruciate ligament of the knee, the characteristics of the division of the bundle, and the stopping points of the tibia and the femur from a biological evolutionary point of view. Through my study, I believe that there is a commonality in the morphology of the cruciate ligament of the knee joint in human beings, and even though the morphology of the cruciate ligament varies slightly from person to person, it is generally a flat band rather than a cylindrical ligament. To simulate this flat band, the stop at the femur is oval-like or crescent-shaped. To simulate this shape of stop, the best method currently available is a double-bundle reconstruction, which means that two holes are punched within the oval shape and two bundles of ligaments are used for reconstruction. This is because punching one hole in the oval bone causes a loss of strength in the femoral condyle and a risk of fracture. Ten years ago, the failure rate of double-bundle reconstruction was very high, especially the posterior bundle often broke, because the anatomy of the ACL was not well understood, and the posterior bundle was made forward. Therefore, I invented the “ETE Double Bundle Reconstruction Technique”, in which the posterior bundle is shifted posteriorly and the result is significantly improved. Many patients who have undergone ACL surgery with this technique have been able to return to the field. The edge of the bone channel is tangent to the edge of the femoral condyle.