ANALYSIS OF FATIGUE FAILURE OF BONE USING STRESS- STRAIN CURVE FOR IMPROVED PROSTHESIS DESIGNING

Abstract

Mathematical studies of mechanical and rheological behavior of synovial fluid closely or directly connected with human physiology play an important role in several areas of Biomedical Engineering. The fundamental research on biological systems plays an important role for the future medical treatments or bio-engineering development. In this thesis, the application of weibull statistics for load cycle analysis of fatigue failure of bone has been studied. It was found that the synovial fluid reacts very sensitively to the magnitude of shear stress and fatigue occur on the articulating surface of the knee joint during knee motions namely flexion and extension and vice versa. An S-N curve for knee joint was developed in order to study the variation of failure stress with respect to number of load cycle. A reliability study of bone failure was carried out for a wide variation of stress cycles and also for different weights. As probability of failure increases with aging, such studies were carried out to determine fracture strength of bone in different ages and with different weights.