Patient mass (kg) BMI (kg/m2) Patella maximum averaged shear stress (MPa) Flexion Femur maximum averaged shear stress (MPa) Flexion (degrees)
50 16 1.76 67.5 1.56 67.5
70 23 2.05 67.5 1.86 67.5
90 29 2.36 63 2.20 72
110 36 3.71 76.5 2.76 81
Table 2: Maximum shear stress in a healthy knee, cartilage modelled as viscoelastic material for a 200 mm step descent..