Fig. 2

Blumensaat’s line is represented by ‘d’,with ‘b’ representing the line perpendicular to it. ‘a’ is the distance between the femoral tunnel center to Blumensaat’s line, and ‘c’ is the distance between the femoral tunnel center to b. Thus, a/b represents the height ratio, i.e., the ratio of the distance between the femoral tunnel center and the top of intercondylar notch to the total height of intercondylar notch; and c/d represents the depth ratio, i.e., the ratio of the distance between the femoral tunnel center and posterior articular surface of femoral lateral condyle to the total depth of intercondylar notch