SEARCH Articles Figures Tables A deep fold is formed at the border between the mid-substance and the fanlike extension fibers during knee flexion. Therefore, it is meaningless to reconstruct the fanlike extension fibers in ACL reconstruction. However, the mid-substance fibers of the AM and PL bundles can be reconstructed by creating two tunnels at the center of the femoral direct attachment of the AM or PL mid-substance fibers, respectively [Publishers Imprint]