Experimental Analysis of Stress Shielding Effects in Screw Spacers Placed in Porcine Spinal Tissue.

IF 5 3区医学 Q1 ENGINEERING, BIOMEDICAL Journal of Functional Biomaterials Pub Date : 2024-08-22 DOI:10.3390/jfb15080238

Elliot Alonso Alcántara-Arreola, Karla Nayeli Silva-Garcés, Jocabed Mendoza-Martínez, Miguel Antonio Cardoso-Palomares, Christopher René Torres-SanMiguel

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Abstract

Bone cortical tissues reorganize and remodel in response to tensile forces acting on them, while compressive forces cause atrophy. However, implants support most of the payload. Bones do not regenerate, and stress shielding occurs. The aim is to analyze the biomechanical behavior of a lumbar cage to study the implant's stress shielding. The ASTM E-9 standard was used with the necessary adjustments to perform compression tests on lumbar and thoracic porcine spinal vertebrae. Twelve cases were analyzed: six with the metal prosthesis and six with the PEEK implant. A mathematical model based on the Hertz contact theory is proposed to assess the stress shielding for endoprosthesis used in spine pathologies. The lumbar spacer (screw) helps to reduce the stress shielding effect due to the ACME thread. The best interspinous spacer is the PEEK screw. It does not embed in bone. The deformation capability increases by 11.5% and supports 78.6 kg more than a system without any interspinous spacer.

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放置在猪脊柱组织中的螺钉垫片应力屏蔽效应的实验分析

骨皮质组织在拉力作用下会重组和重塑，而压缩力则会导致萎缩。然而，植入体支撑着大部分的有效负荷。骨骼不会再生，会出现应力屏蔽。我们的目的是分析腰椎笼的生物力学行为，以研究植入物的应力屏蔽。在对腰椎和胸椎猪脊椎骨进行压缩测试时，使用了 ASTM E-9 标准并进行了必要的调整。共分析了 12 个病例：6 个使用金属假体，6 个使用 PEEK 植入体。根据赫兹接触理论提出了一个数学模型，用于评估脊柱病变中使用的内假体的应力屏蔽。由于 ACME 螺纹的存在，腰椎间距器（螺钉）有助于减少应力屏蔽效应。最好的棘间垫片是 PEEK 螺钉。它不会嵌入骨头。与不使用棘间钉的系统相比，其变形能力增加了 11.5%，支撑力增加了 78.6 千克。

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来源期刊

Journal of Functional Biomaterials Engineering-Biomedical Engineering

CiteScore

4.60

自引率

4.20%

发文量

226

审稿时长

11 weeks

期刊介绍： Journal of Functional Biomaterials (JFB, ISSN 2079-4983) is an international and interdisciplinary scientific journal that publishes regular research papers (articles), reviews and short communications about applications of materials for biomedical use. JFB covers subjects from chemistry, pharmacy, biology, physics over to engineering. The journal focuses on the preparation, performance and use of functional biomaterials in biomedical devices and their behaviour in physiological environments. Our aim is to encourage scientists to publish their results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Several topical special issues will be published. Scope: adhesion, adsorption, biocompatibility, biohybrid materials, bio-inert materials, biomaterials, biomedical devices, biomimetic materials, bone repair, cardiovascular devices, ceramics, composite materials, dental implants, dental materials, drug delivery systems, functional biopolymers, glasses, hyper branched polymers, molecularly imprinted polymers (MIPs), nanomedicine, nanoparticles, nanotechnology, natural materials, self-assembly smart materials, stimuli responsive materials, surface modification, tissue devices, tissue engineering, tissue-derived materials, urological devices.