FIGURE 10.

Schematic representation of the performed identification procedure. 1. The viscous damping coefficient (c) and the viscous friction coefficient (µ) were determined by nonlinear curve-fitting of the exponential decay function (Crisco et al., 2007) as described in the materials and methods section. 2. Following, the differential equation of the physical pendulum motion (Crisco et al., 2007) was solved with the same input values (initial deflection (θ₀), moment of inertia (I), pendulum mass (m), radius of the femoral condyle (r), distance between the pendulum center of mass and the rotation axis (L)) and the determined values for the friction coefficient (µ) and damping coefficient (c) using MATLAB Simulink. 3. The comparison of the recorded flexion-extension motion (red) and the generated oscillation (blue) indicated very similar oscillation data over time.