Title :
An in vitro study of hydraulic stiffening in cancellous bone
Author :
Petrella, A.J. ; Hillberry, B.M.
Author_Institution :
Sch. of Mech. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
It was hypothesized that cancellous bone is a poroelastic material, and appropriate property data were obtained from the literature to formulate a three-dimensional poroelastic finite element model. Thirty-three cylindrical cancellous bone samples (bovine) were subjected to compressive cyclic strain excitation (triangle wave) with a maximum of 2000 με. All specimens showed clear signs of time dependent material behavior: the force response lagged the displacement input in phase (φ=4.4°-15.8°), and contained a decaying transient term. The finite element model underestimated the transient behavior (φ=1.3°-3.8°) and predicted that less than 10% of bulk tissue stress was borne by the fluid. Decreasing the permeability value of the cancellous tissue was found to bring the model predictions into closer qualitative agreement with the experimental results, indicating the need for further study of this important parameter
Keywords :
biomechanics; bone; finite element analysis; permeability; physiological models; bone biomechanics; bovine; bulk tissue stress; cylindrical cancellous bone samples; displacement input; finite element model; force response; hydraulic stiffening; in vitro study; model predictions; permeability value; three-dimensional poroelastic finite element model; time dependent material behavior; Bovine; Cancellous bone; Capacitive sensors; Finite element methods; In vitro; Mechanical engineering; Mechanical factors; Predictive models; Steel; Testing;
Conference_Titel :
Biomedical Engineering Conference, 1996., Proceedings of the 1996 Fifteenth Southern
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-3131-1
DOI :
10.1109/SBEC.1996.493213
