A Comparative Experimental Study on The Human and Artificial Hip Joint:Stress Analysis with Static Load Time and Impact Load.(Dept.M)

Yousef Ibrahim,O El-Awadi,M Zaki,El-Sayed Abd El-Rassoul

doi:10.21608/bfemu.2021.160906

Abstract

Although the understanding of the mechanical properties and fracture behaviour of bone is continuously improving, as yet it's far from complete. So, this paper represents an experimental study about the effect of static and dynamic loads under different parameters on intact bone and human hip joints. The same test will be applied on the human hip joints after insertion of the artificial femur component in the bone. A special test-rig was designed in order to fix both natural and artificial implant and expose them to a state of loading similar in magnitude and direction to that encountered in the human-being.A comparison between the stress-strain distribution of the intact and artificially implanted bones were conducted by using strain gauges. The results showed that the stresses were reversed after insertion of the artificial femoral component and the stresses were maximum at the near of the tip of the prothesis. Also, the absence of the collar-calcar causes a severe reduction of the stresses which may be due to important metabolic changes.

Highlights

The study of the mechanical stresses in bones is needed to develop quantitative specifications for substitute materials and to ensure effective mechanical compatibility and stabnity of implants and pros-J\etic devices which are often used to replace parts of defective or fractured bones
The results showed that the stresses were reversed after insertion of the artificial femoral component and the stresses were maximum at the near of the tip of the prothesis
One of the major mechanical problems encountered with total hip replacement was referred to the loosening of femoral component [1,2,3]

Summary

Introduction

The study of the mechanical stresses in bones is needed to develop quantitative specifications for substitute materials and to ensure effective mechanical compatibility and stabnity of implants and pros-J\etic devices which are often used to replace parts of defective or fractured bones. A mechanical mismatch, because of greatly different elastic properties of the bone and the implant, will produce a stress concentration that might lead to early failure. One of the major mechanical problems encountered with total hip replacement was referred to the loosening of femoral component [1,2,3]. Both mechanical and biological phenomena has been proved to playa major role in this loosening process. Some of them {6] studied the effect of dynamic loads on the biomechanical characteristics of bones

Methods

Results

Conclusion