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(A) Knee flexion angle digitised at the frame prior to initial contact and recorded as the first measure of knee flexion range of motion (ROM) (Θ1). (B) Knee flexion angle, digitised at the frame with maximum knee flexion and recorded as the second measure of knee flexion ROM (Θ2). (C) Displacement of knee flexion, calculated as the differences in knee flexion angles at the frame prior to initial contact and maximum knee flexion (Θ1–Θ2) and representative of knee flexion ROM.
