Anterolateral rotatory instability in vivo correlates tunnel position after anterior cruciate ligament reconstruction using bone-patellar tendon-bone graft

Figure 2 Evaluation of tunnel positions in femur and tibia. A: 3D CT-based model of a femoral bone tunnel after an ACL reconstruction. Tunnel position was assessed according to the quadrant method[46]. Depth = (distance from the posterior edge to tunnel center along Blumensaat’s line/total length of the lateral condyle) × 100%. Height = (distance from Blumensaat’s line to tunnel center/total height of the intercondylar roof) × 100%; B: For tibial side, Staubli’s technique was used[47]. Anterior-posterior position = (a/b) × 100%. a: Distance from anterior edge to tunnel center; b: Anteroposterior length of the tibia plateau. ACL: Anterior cruciate ligament.