Effect of Neck-Shaft Angle on the Stress Response of Femur Bone
Sridhar Adibhatla1, Satya Devi. A2, N.V. Swamy Naidu3

1Sridhar Adibhatla,  P.H.D, Gandhi Institute of Technology and Management, Deemed University, Hyderabad, Telangana, India.

2Dr. Satya Devi, A, Professor, Department of Aerospace Engineering, Gandhi Institute of Technology and Management, Deemed University, Hyderabad, Telangana, India.

3Dr. N.V. Swamy Naidu, Associate Professor, Department of Mechanical Engineering, National Institute of Technology, Raipur, Kharagpur, India.

Manuscript received on 10 April 2019 | Revised Manuscript received on 17 April 2019 | Manuscript Published on 24 May 2019 | PP: 724-728 | Volume-8 Issue-6S3 April 2019 | Retrieval Number: F11430486S319/19©BEIESP

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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open-access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: The neck region of femur is of great clinical importance and most general area which undergoes stress fractures. The femoral neck shaft angle (NSA) play major role to identify the structural deformities in femur. The present research is focused on stress analysis of femur with different NSA using finite element method (FEM). In order to identify the effects of NSA on stress response in the femur bone, two different femur geometries were considered and FE models were developed with NSA varying from 1100 -1700 . Two different porosity levels (50% and 75%) with isotropic material properties were considered for the stress analysis. The force on the femoral head was applied at 0 0 and 160 to the vertical axis in the frontal plane. Two different anteversion angles (12 0 and 240 ) were also considered. The results showed that there exists a direct relationship between stress and porosity. Also, there exists an inverse relationship of stress with NSA, anteversion and force inclination angle. It could be concluded that the subjects with lower NSA in combination with higher porosity are more prone to stress related fractures. Higher anteversion than normal, helps to reduce the stress magnitude when the rotation is internal.

Keywords: Anteversion, Femur, Neck-Shaft Angle, Porosity.
Scope of the Article: Mechanical Maintenance