NUMERICAL MODELING FOR MECHANICAL CHARACTERISTICS STUDY OF DIFFERENT MATERIALS ARTIFICIAL HIP JOINT WITH INCLINATION AND GAIT CYCLE ANGLE EFFECT

Author(s): 

Muhannad Al-Waily1*, Emad Q. Hussein2, Nibras A. Aziz Al-Roubaiee2

Affiliation(s): 

1Department of Mechanical Engineering, Faculty of Engineering, University of Kufa, Iraq

2Department of Mechanical Engineering, Faculty of Engineering, University of Kerbala, Iraq

*Corresponding Author E-mail: muhanedl.alwaeli@uokufa.edu.iq

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

This research introduces a combination study, where it discusses the effect of the implanted cup position in the acetabulum with three different angle values of inclination (35o,45o,55o) and also the effect of these angles with specified angles (phases) during the gait cycle (-10o,0o,30o). Besides that, the effect of the head diameter size (28mm,32mm,36mm) when it changed with every single case. All these details and specifications are applied on a modular type of total hip replacement. Besides that, these results are obtained by numerical and mathematical estimations for comparison and validation. After all these calculations; this study showed that the best angle of inclination is 45o and the worst angle is (35o), where edge loading is higher in this angle and that leads to produce higher strains and stresses in the implanted cup and tries to dislocation the joint. A comparison is worked among three THR types (MoP, Cop and CoC), the results showed that, ceramic have low values of strain and stress, and that try to increase the lifespan of the joint. The aim of this study is giving a guide and advice about implantation of the cups for the Surgeons to avoid any side effect as possible that leads to reoperation the hip joint. Also, to give a prediction study to know the reasons those are responsible for producing edge loading and avoid it. The investigation also included validation for results with other results of previous papers, therefore, its validation shown that the maximum error does not exceed about (6.48%).