One knee of each participant was imaged at 3T using a Trio Tim Siemens magnetic resonance imaging (MRI) scanner. Sagittal, coronal, and axial plane images were acquired using a double-echo steady-state sequence (voxel size, 0.3 × 0.3 × 1 mm3; flip angle, 25°; repetition time, 17 ms; echo time, 6 ms) and an 8-channel knee coil.11 (link),39 (link) High-speed biplanar radiographs (matrix size, 1152 × 1152 pixels2; frame rate, 120 Hz; pulse width, 1.5 ms) were obtained as participants performed a single-leg jump.18 (link),20 Specifically, participants were asked to keep their trunk upright, jump vertically, and land on the same location of the force plate embedded in the treadmill. After several practice jumps to ensure that the participant was able to perform the motion within the field of view, high-speed biplanar radiographs were obtained at a frame rate of 120 Hz as the participant performed the motion. Ground-reaction forces (GRFs) were obtained at a sampling rate of 1200 Hz using an instrumented dual-belt treadmill (Bertec).