Anterior Cruciate Ligament Remnant-Preserving Reconstruction Using a "Lasso-Loop" Knot Configuration.

Anterior cruciate ligament (ACL) rupture predisposes to altered kinematics and possible knee joint degeneration. Graft fiber maturation and ligamentization may eliminate this risk during ACL reconstruction procedures. ACL remnant-sparing techniques support the theory that the preserved tissue enhances revascularization, preserves the mechanoreceptors, and leads to anatomic remodeling. The purpose of this article is to present a simple and reproducible technique of tensioning the preserved ACL remnant over the femur. A nonabsorbable suture is passed through the ACL remnant with a "lasso-loop" technique using a curved rotator cuff hook. Femoral and tibial tunnel preparation is performed according to a standard surgical technique for the EndoButton device (Smith & Nephew Endoscopy, Andover, MA). The free ends of the ACL remnant suture are retrieved through the tibial tunnel and passed through each outside hole of the EndoButton device. The hamstring graft is passed through the tibial and femoral tunnels and fixed to the femoral cortex by flipping the EndoButton and to the tibia by an interference screw. Finally, non-sliding half-stitch locking knots are made to secure the ACL remnant suture on the EndoButton device, by use of a knot pusher. This technique offers simple and secure tensioning of the ACL remnant on the fixation device.