Poroelastic Model of Vertebral Trabecular Bone in the Uniaxial Stress Condition and Experimental Validation

Abstract

Abstract The theory of poroelasticity that includes the fluid-solid coupled mechanical interactions has been used to study the effect of intraosseous fluid flow on mechanical behavior of trabecular bone. The unique time-dependent behavior and strain rate effect of trabecular bone have been modeled by using the poroelastic theory.1,2 Thus, its general mechanical behavior including the time-dependent and elastic behavior can be predicted using the poroelastic theory. In this study, a 2-D poroelastic model was developed to investigate the effect of strain rate input on mechanical behavior of trabecular bone from the poroelastic constitutive equations under the uniaxial stress condition at various strain rate inputs. Compression tests in the uniaxial stress condition at various strain rates were also performed using bovine vertebral trabecular bone specimens to validate the poroelastic model.