Recovery K (MPa) G0 (MPa) G∞ (MPa) E (MPa) 25% of recovery following stage 2 137.8 8.44 3.04 25 50% of recovery following stage 2 444 27.2 9.80 80 75% of recovery following stage 2 723 44.3 15.9 130 Healthy cartilage 861 52.7 19.0 155

Table 1: Visco-elastic material constants used for cartilage, computed from the logistics curve for most biological recovery processes [5]. K is the bulk modulus G0 is the initial shear modulus, G∞ is the shear modulus after a load has been applied for an infinite time, E is the Young’s modulus.