Citation

Soliman, Md Mohiuddin and Alharthi, Abdullah and Alawad, Mohamad A. and Alenezi, Abdulmajeed M. and Islam, Md. Shabiul and Islam, Mohammad Tariqul (2026) Impact of leg length adjustment, base offset, neck length and neck cross-section variations on hip implant joints and neck mechanics. Materials & Design, 266. p. 116181. ISSN 0264-1275

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Abstract

This study examines the influence of base offset, leg-length adjustment, neck length, and neck cross-section on hip implant joints and neck mechanics. Eleven designs (eight geometric variations and three neck cross-sections) were modelled in SolidWorks and analyzed using finite element analysis in ANSYS under walking gait cycle. Across all designs, neck geometry caused only minor variations in trunnion stress and micromotion (max 2.5–35 MPa, micromotion 3.75–4.5 µm), while head–liner stresses remained low (<5 MPa) with negligible changes. Maximum penetration at both interfaces follows the contact pressure pattern. The von Mises stress results show that Designs 1–6, and all neck cross-sections, remain below the yield strength of Ti6Al4V for all load cases, while Designs 7 and 8 exceed the yield limit at loads above 3000 N. Implant deformation increases with neck length, offset, and leg length, from 0.012 mm (Design 1) to 0.56 mm (Design 8), and the rectangular–oval cross-section showing the highest values (0.08 mm). Overall, while contact parameters are minimally affected by neck geometry, von Mises stress and deformation are strongly influenced by neck design, with Designs 1–6 and all cross-sections neck mechanically stable and Designs 7–8 unstable under higher loads.

Item Type:	Article
Uncontrolled Keywords:	Hip implant, Leg length adjustment, Base offset, Neck length and cross-section, Human gait cycle
Subjects:	Q Science > QP Physiology > QP351 Neurophysiology and Neuropsychology
Divisions:	Faculty of Artificial Intelligence & Engineering (FAIE)
Depositing User:	Ms Suzilawati Abu Samah
Date Deposited:	08 Jun 2026 00:01
Last Modified:	08 Jun 2026 00:01
URII:	http://shdl.mmu.edu.my/id/eprint/16082

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