Location of Parsons' knob
After identifying Parsons' knob, its location was presented in a grid anatomically aligned with the medial-to-lateral and anterior-to-posterior anatomical tibial axes, as previously described.18 and 19 In a true proximal-to-distal view of the tibial plateau, the medial-to-lateral anatomical tibial axis was defined by the line between the most posterior margin of the medial tibial condyle and the lateral tibial condyle, and anterior-to-posterior anatomical tibial axis was defined by the line perpendicular to the line between the most posterior margin of the lateral tibial condyle and the medial tibial condyle. The anterior-to-posterior and medial-to-lateral positions of Parsons' knob were determined with the use of a true proximal-to-distal view of the tibial plateau