Fig. 8.

Femoral socket(s) on three-dimensional computed tomography (3D CT) after surgery. Medial 3D CT view of the reconstructed distal femur at 1 week after surgery shows accurately placed femoral sockets for hamstring tendon graft (A) and an accurately placed rectangular femoral socket for a bone-patellar tendon-bone graft (BTB) (B). Morphometric assessment of femoral tunnel positioning was performed using the quadrant technique, as described by Bernard et al.17). The horizontal position of the femoral tunnel center is defined as the percentage distance from the most posterior contour in reference to the total length of the lateral condyle, whereas its vertical position is defined as the percentage distance from Blumensaat's line in reference to the total lateral intercondylar notch height. For the rectangular tunnel for the BTB grafts, the center of the ellipse by which the rectangular tunnel aperture was approximated was defined as the center of the femoral tunnel for the BTB graft. The black square shows the location of the center of the anteromedial socket, the black triangle shows the location of the posterolateral socket, and the black dot shows the center of the socket location in anterior cruciate ligament reconstruction using a BTB graft.