Finite element simulation of femoral stems lightweighted with re-entrant honeycomb lattice structure

Yıl 2023, Cilt: 7 Sayı: 3, 128 - 137, 20.09.2023

Özgü Bayrak

https://doi.org/10.26701/ems.1287321

Cited By: 1

Öz

Artificial hip joints are used to replace damaged or diseased natural joints. When the stress that is typically applied to the bone changes because the implant and bone are different in stiffness, a phenomenon known as stress shielding occurs. Stress shielding can lead to bone weakening through reduced density and aseptic loosening in the long term. Studies are ongoing to overcome this phenomenon through geometric design, the use of materials with a low modulus of elasticity, or latticed implants. In this study, the effect of lightening the hip prosthesis with lattice structures on stress shielding is investigated using finite element simulation. The femoral stem of a solid hip prosthesis was lightweighted, with a re-entrant honeycomb auxetic cellular lattice structure, and structural analysis was performed. Two different lattice orientations were used, and it was observed that the stress distribution was more homogeneous in both orientations. In these femoral stems, which can be easily produced using additive manufacturing methods, a volume reduction of up to 16% was achieved. The stress transmitted to the bone increased by more than 36%, depending on the orientation, which is a promising result for reducing the stress shield effect.

Anahtar Kelimeler

Hip prosthesis, stress shielding, re-entrant lattice structure, finite element analysis.

Kaynakça

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