Citation

Soliman, Md Mohiuddin and Alawad, Mohamad A. and Alenezi, Abdulmajeed M. and Islam, Md. Shabiul and Soliman, Mohamed S. and Islam, Mohammad Tariqul (2026) Effect of varying trunnion geometry of hip implant on contact mechanics under walking gait cycle: A finite element study. Materials & Design, 268. p. 116453. ISSN 02641275

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Abstract

This study investigates the contact parameters at the trunnion by analyzing the effects of four key geometric factors: distal and proximal chamfer geometry, contact length and surface geometry, and acetabular head diameter, to identify designs that reduce the risk of contact-related failures. The forces are exerted in the Fx, Fy, and Fz directions on hip implant acetabular head. The chamfer cut improve the contact stress distribution, micromotion, and penetration, whereas trunnions without a chamfer exhibit stress concentration that can lead to edge damage and joint failure. Increasing the contact length from 10 to 17.5 mm improves contact stress, micromotion and penetration and contributes to a lower wear rate. The acetabular head diameter variation has very negligible effect on the contact parameters at trunnion. Furthermore, angular mismatches at trunnion create a shielding effect, resulting in contact stress concentration and potential damage at the trunnion edges. Notably, spur gear trunnion models with 4 and 8 teeth show superior performance by reducing sliding distance and wear rate. These findings offer valuable insights for optimizing trunnion design to improve implant longevity and performance.

Item Type:	Article
Uncontrolled Keywords:	Hip implant, contact stress
Subjects:	R Medicine > R Medicine (General) > R858-859.7 Computer applications to medicine. Medical informatics
Divisions:	Faculty of Artificial Intelligence & Engineering (FAIE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	30 Jun 2026 05:08
Last Modified:	30 Jun 2026 05:08
URII:	http://shdl.mmu.edu.my/id/eprint/16140

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