Analysis of the Yield Condition of Porous Bone-implant Fixation

In this paper a theoretical analysis of porous bone-implant coupling is performed. The cancellous bone is described as a hollow circular cylinder formed of isotropic poroelastic material filled with viscous intraosseous fluid. The conical metallic implant, axially compressed, is assumed to be undeformable in comparison to cancellous bone. The Biot's formulation of theory of poroelasticity is used and by means of the modified Huber-Mises yield criterion the new yield condition (constitutive equation) has been determined as a function of strain. From this criterion it is possible the maximum permissible displacement of implant seating in bone to determine.