Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding.
Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding.
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DOI：
10.3390/ma14237184
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发表时间：
2021-11-25
期刊：
影响因子：
--
通讯作者：
van Arkel RJ
中科院分区：
文献类型：
--
作者：
Tan N;van Arkel RJ
僵硬的全髋关节置换术植入物可导致应变屏蔽、骨丢失和复杂的翻修手术。本研究的目的是开发拓扑优化技术，使髋关节植入物设计更符合要求。采用固体各向同性材料惩罚（SIMP）方法，设计并制造了两种髋关节茎：(1)基于随机多孔结构的茎，(2)选择性中空方法的茎。通过有限元分析和实验测量来测量阀杆刚度并预测应力屏蔽的减小。与实心植入物相比，选择性中空植入物可增加植入周围股骨表面应变达25个百分点，而不影响预测强度。尽管在设计上存在明显差异，但实验测量的刚度结果在两种优化后的假体中几乎相同，与固体假体相比，多孔假体和选择性中空假体的等效刚度分别降低了39%和40%。选择性中空植入物的内部结构与股骨的骨小梁结构惊人地相似，暗示了自然设计过程和拓扑优化之间的内在一致性。开发的拓扑优化过程使髋关节植入物设计更符合自然负载转移，减少应变屏蔽和改善植入物存活。
Stiff total hip arthroplasty implants can lead to strain shielding, bone loss and complex revision surgery. The aim of this study was to develop topology optimisation techniques for more compliant hip implant design. The Solid Isotropic Material with Penalisation (SIMP) method was adapted, and two hip stems were designed and additive manufactured: (1) a stem based on a stochastic porous structure, and (2) a selectively hollowed approach. Finite element analyses and experimental measurements were conducted to measure stem stiffness and predict the reduction in stress shielding. The selectively hollowed implant increased peri-implanted femur surface strains by up to 25 percentage points compared to a solid implant without compromising predicted strength. Despite the stark differences in design, the experimentally measured stiffness results were near identical for the two optimised stems, with 39% and 40% reductions in the equivalent stiffness for the porous and selectively hollowed implants, respectively, compared to the solid implant. The selectively hollowed implant’s internal structure had a striking resemblance to the trabecular bone structures found in the femur, hinting at intrinsic congruency between nature’s design process and topology optimisation. The developed topology optimisation process enables compliant hip implant design for more natural load transfer, reduced strain shielding and improved implant survivorship.
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