The tibial tunnel refers to the drill hole on the tibia through which a replacement anterior cruciate ligament is threaded during an ACL reconstruction.

Single-bundle ACL reconstruction with a single tibial tunnel and single femoral tunnel.
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FORUM DISCUSSIONS
ACL Recon OS used staples instead of screws because of soft bones ??
CLINICAL PUBLICATIONS
Morphological changes in tibial tunnels after anatomic anterior cruciate ligament reconstruction with hamstring tendon graft. Ohori T, Mae T, Shino K, Tachibana Y, Sugamoto K, Yoshikawa H and Nakata K. J Exp Orthop. 2017 Dec; 4: 30.
Tibial tunnel enlargement after anatomic anterior cruciate ligament reconstruction with a bone-patellar tendon-bone graft. Part 1: Morphological change in the tibial tunnel. Ohori T, Mae T, Shino K, Tachibana Y, Yoshikawa H and Nakata K. J Orthop Sci. 2019 Jan 29. pii: S0949-2658(19)30012-0. doi: 10.1016/j.jos.2019.01.004. [Epub ahead of print]