Smeets K, Haver AV, den Bempt SV, et al. - Via three-dimensional (3D) CT reconstructions of 32 knees following transtibial (n = 16) or anteromedial portal (AMP) (n = 16) anterior cruciate ligament (ACL) reconstruction, researchers evaluated the risk of tunnel collision in combined ACL and anterolateral ligament (ALL) reconstructions. When the ALL tunnel was aimed at 20° in the coronal plane and 0° in the axial plane, the highest rate of tunnel collision was noted. Nevertheless, by aiming the ALL tunnel at 0° coronal and 40° axial angulation, the collision was circumvented in all patients and no violation of the trochlea was noted. When the ACL tunnel was drilled by the AMP technique, the tunnel collision rate was significantly greater. Thus, when the tunnel was drilled at 0° in the axial plane, the risk of tunnel collision was significantly raised. Moreover, by aiming the ALL tunnel 40° anteriorly and perpendicular to the anatomical axis of the femur, the tunnel collision was bypassed. A risk factor for tunnel conflicts was a more horizontal orientation of the ACL with the AMP technique.