This analysis demonstrates linear and nonlinear stress responses in articular cartilage under confined compression, suggesting the significance of hydraulic permeability and elastic constants.
Intrinsic material parameters in the linear, isotropic poroelastic model which are required to predict tissue mechanical response include elastic constants of the solid matrix (equilibrium modulus, HA, and Poisson’s ratio) and a hydraulic permeability, k, to describe the fluid-solid interaction. A traditional test for determining HA and k uses the confined compression geometry where a cylindrical disk of cartilage is placed inside a tightly fitting well with impermeable base and side walls. A porous platen contacts the top surface of the specimen. Two common displacement control protocols use either a ramp-hold [I] or an oscillatory sinusoid [2]. Our goals were to characterize: 1) the linearity of the stress responses using small amplitude displacements 2) the role of the porous compressing platen, and finally 3) the applicability of the poroelastic model.
No takes yet. Share an insight, caveat, or question.
Buschmann et al. (1995) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: