(A) Schematic of roentgen stereophotogrammetric analysis bead pair placement in relation to tear. (A) Schematic of roentgen stereophotogrammetric analysis bead pair placement in relation to tear. Distances measured by vectors: a—absolute, b—transverse and c—vertical. (B) Changes in separation for each vector. Positive values indicate widening. Negative values indicate compression. MCL, medial collateral ligament region of posterior horn of medial meniscus; mid post, middle of posterior horn; post root, posterior root area of medial meniscus. Robert C Spang III et al. BMJ Open Sport Exerc Med 2018;4:e000212 ©2018 by BMJ Publishing Group Ltd