Fig. 4

Bone tunnel aperture centers deviations from the center of native ACL footprints. Femoral and tibial bone tunnel apertures positions are represented in the sagittal and coronal planes relatively to the anatomic center of the ACL femoral and tibial footprints, which is represented by the origin of the X- and Y-axis (x = y = 0) of both graphs. Ratios between the position of the bone tunnel center relatively to the total length of the bone in each plane were calculated. The same was made for native ACL center. Axis scales correspond to the difference between those two ratios. X-axis represents the lateromedial deviation of the bone tunnel aperture from the position of the center of the ACL footprint, relatively to the lateromedial length of the bone; positive values correspond to lateral deviation, while negative values to medial deviation. Y-axis represents the anteroposterior deviation of the bone tunnel aperture from the position of the center of the ACL footprint, relatively to the length of the bone measured in the coronal plane; positive values correspond to posterior deviation, while negative values to anterior deviation. Each point designates the center of the bone tunnel aperture of one animal, and each color-filled disc represents the entire bone tunnel aperture area relatively to the corresponding lateromedial and anteroposterior length of the bone. The blue and red circles represent the entire insertion area of the ACL on the femur and tibia, respectively, relatively to the corresponding lateromedial and anteroposterior length of corresponding bones. The dotted lines represent the corridors defined by the margins of the ACL footprints to consider as anatomically or non-anatomically positioned the bone tunnel aperture centers