Using the posterior condylar axis as a reference, the anterior of the medial side is located posterior to the lateral side. The specific anterior edge line of the posterior slope angle with respect to the posterior condylar axis has been reported to be approximately 5.2–10 degrees (^*1). The actual surgical position is anterior to the femoral condyle; therefore, when viewed in a cross-section, it is parallel to the SEA, which is the knee flexion/extension axis. Considering that the SEA is externally rotated approximately 3–5 degrees from the posterior condylar axis (^*2), the anteromedial side is thought to be located further back. When compared to the intercondylar axis, several reports have described a steep slope of approximately 10 degrees on the lateral side (^*3) and approximately 25 degrees on the medial side (^*4) with a trapezoidal shape and a narrow anterior width and wide posterior width in the axial plane. Because the lateral plate is positioned further anteriorly than the medial plate with a smaller mediolateral slope, the screw is inserted more anterior-to-posterior on the lateral plate than the medial plate (^*5, 6). Therefore, a longer screw may be inserted if the lateral plate is directed further posteriorly.