Tibial Tubercle–Posterior Cruciate Ligament Distance: A New Measurement to Define the Position of the Tibial Tubercle in Patients With Patellar Dislocation. - Seitlinger, Gerd; Scheurecker, Georg; Högler, Richard; Labey, Luc; Innocenti, Bernardo; Hofmann, Siegfried (American Journal of Sports Medicine, 2012)