Citation

Soliman, Md Mohiuddin and Alharthi, Abdullah and Alenezi, Abdulmajeed M. and Alawad, Mohamad A. and Baharuddin, Mohd Hafiz and Islam, Md. Shabiul and Islam, Mohammad Tariqul (2026) Finite element investigation of the effects of proximal and distal diameter variations of the trunnion of hip implants on contact stress, and micro-sliding, under the human gait cycle. Materials Today Communications, 55. p. 115846. ISSN 23524928

Text Finite element investigation of the effects of proximal and distal diameter variations of the trunnion of hip implants on contact stress, and micro-sliding, under the human gait cycle.pdf - Published Version Restricted to Repository staff only Download (5MB)

Abstract

This study presents a Finite Element Model (FEM) analysis to inspect the effect of varying the proximal and distal diameters of the head-neck trunnion on contact behavior during a realistic human walking gait. Two commercially available hip implant systems, AML and Accolade, were evaluated using four taper geometries (12/14, 13/ 14, 14/14, and 15/15). The simulations employed in vivo hip contact forces Fx, Fy, and Fz were obtained from patient data. Boundary conditions were defined as per the ISO 7206–6 standard, where the implant stem was rigidly fixed up to the distal end of the neck and physiological loading was applied to the femoral head. Notably, the simulated contact stress indicates that the 12/14 trunnion obtained the highest maximum contact stress, while the 15/15 trunnion type obtained the lowest maximum contact stress. The maximum contact stress followed an incremental trend for increasing trunnion diameter from 12/14–15/15. The contact stress ranged from 0 to 30 MPa, with the highest concentration at the edges of the proximal and distal regions of the trunnion. On either, the micro-sliding follows a similar trend: the higher trunnion diameter type 15/15 obtained the lowest maximum micro-sliding, while the lowest trunnion diameter 12/14 obtained the highest maximum microsliding. A similar trend was observed for the total sliding over the contact surface of the trunnion for a complete gait cycle. The simulated contact parameters are identical for trunnion types of both AML and Accolade hip implant models. The simulated contact stress and sliding pattern are further verified with clinical retrieval trunnion types, which show a analogous pattern with simulated contact parameters. Finally, the outcomes of the FEM analysis report that the higher diameter of the trunnion shows good stability with uniform contact stress and lower micro-sliding over the gait cycle, which can reduce the fretting loss and improve the fatigue life of hip implant.

Item Type:	Article
Uncontrolled Keywords:	Hip Implant, Trunnion
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA329-348 Engineering mathematics. Engineering analysis
Divisions:	Faculty of Artificial Intelligence & Engineering (FAIE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	04 Sep 2026 01:06
Last Modified:	04 Sep 2026 01:06
URII:	http://shdl.mmu.edu.my/id/eprint/16663

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