Fig. 2

Distance between tibial tunnel center and expected anatomic center. The location on the three-dimensional computed tomography (3D CT)-based tibial surface was expressed as a posterolateral percentage using Tsukada’s method [11]. The anatomic center of the medial meniscus (MM) posterior root attachment was defined by the center of a circle (red dotted circle) that contacted three margins [anterior border of the posterior cruciate ligament (PCL) tibial attachment, lateral margin of the medial tibial plateau, and retro-eminence ridge]. Red dot, expected anatomic center of the MM posterior root attachment (in this example: 77.8% posterior and 38.5% lateral). Blue dot, tibial tunnel center (79.3% posterior and 37.1% lateral). The distance between the tibial tunnel center and anatomic center was 1.58 mm in this patient who underwent MM posterior root repair using the Unicorn Meniscal Root (UMR) guide