Computed Tomography Analysis of the Femoral Tunnel Position and Aperture Shape of Transportal and Outside-In ACL Reconstruction Do Different Anatomic Reconstruction Techniques Create Similar Femoral Tunnels?

Abstract

Background: The desire to perform independent femoral drilling in anterior cruciate ligament (ACL) reconstruction has prompted interest in both the transportal (TP) and outside-in (OI) techniques. However, there have been no in vivo studies on the differences in femoral aperture shape between the 2 techniques. Purpose: To evaluate the femoral tunnel aperture shape and femoral tunnel position between ACL reconstruction using the TP and OI techniques. Study Design: Randomized controlled trial; Level of evidence, 1. Methods: A total of 80 patients were randomized to undergo double-bundle ACL reconstruction using either the TP (n = 40) or OI (n = 40) technique. The femoral tunnel aperture shape (height/width ratio), aperture axis angle (angle between the aperture axis and femoral shaft axis), and femoral tunnel position were assessed by computed tomography. Results: The mean height/width ratio of the anteromedial (AM) femoral tunnels in the TP group (1.35 0.16) was significantly more ellipsoidal than that in the OI group (1.22 0.16) (P = .008). There was no difference between the 2 groups in the posterolateral (PL) tunnels (TP, 1.32 +/- 0.23; OI, 1.35 +/- 0.29; P = .99). The mean aperture axis angle of the PL femoral tunnels in the OI group was significantly more perpendicular to the