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Exemplary flexion-extension data in the sagittal plane of a knee joint motion, characterized by a non-linear decay over time. Illustration and exemplary values for the goodness of fit (R 2) of (A) the linear decay function of the boundary friction model (Stanton, 1923) and (B) the exponential decay function of the viscous friction model (Crisco et al., 2007) on the decaying motion.
