Accession Number : AD0752981

Title :   A Structural Model for the Mechanical Behaviour of Trabecular Bone.

Descriptive Note : Technical rept.

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE

Report Date : 28 NOV 1972

Pagination or Media Count : 43

Abstract : A quantitative model is developed for trabecular bone by approximating the trabecular geometry with a hypothetical network of compact bone. For the region immediately beneath the articular cartilage in the distal end of the femur, finite element analyses were performed with a high speed computer, assuming a physiological static load. The results indicate that bending and buckling of trabeculae are considerable in any elastic deformation of the bone; that fatigue fracture in some fraction of suitably oriented trabeculae is inevitable in normal ambulation; and that the stiffness varies considerably with lateral position across the subchondral plate. The latter depends totally on trabecular arrangement and may play a role in joint function and degeneration. The adjustments necessary to bring the gross stiffness into agreement with experiment imply that the intertrabecular soft tissues are of no consequence to the mechanical properties and that the compact bone of which trabeculae are made is probably not as stiff as cortical bone. (AUthor)

Descriptors :   (*BONES, ELASTIC PROPERTIES), MECHANICAL PROPERTIES, CARTILAGE, MODELS(SIMULATIONS), VISCOELASTICITY, STRESSES, BONE FRACTURES

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE