Model-predicted effect of the frontal plane moment on the peak AM-ACL relative strain, peak LCL and MCL relative strain, peak axial tibial rotation, and peak knee valgus-varus angle. The positive frontal plane moment values represent the knee valgus moment (VAL), whereas the negative frontal plane moment values represent the knee varus moment (VAR). The shaded area indicates the range of the frontal plane moment where the medial or lateral joint opening occurred. ACL, anterior cruciate ligament bundle; AM, anteromedial bundle; LCL, lateral collateral ligament; MCL, medial collateral ligament. insights into AM-ACL behavior under the different loading conditions.