A novel personalized homogenous finite element model to predict the pull-out strength of cancellous bone screws.

IF 2.8 3区 医学 Q1 ORTHOPEDICS
Alireza Rouyin, Mohammadjavad Matin Einafshar, Navid Arjmand
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引用次数: 0

Abstract

Background: Orthopedic surgeries often involve the insertion of bone screws for various fixation systems. The risk of postoperative screw loosening is usually assessed through experimental or finite element (FE) evaluations of the screw pull-out strength. FE simulations are based on either personalized complex but accurate heterogeneous modeling or non-personalized simple but relatively less accurate homogeneous modeling. This study aimed to develop and validate a novel personalized computed tomography (CT)-based homogeneous FE simulation approach to predict the pull-out force of cancellous bone screws.

Methods: Twenty FE simulations of L1-L5 vertebral screw pull-out tests were conducted, i.e., 10 heterogeneous and 10 homogenous models. Screws were inserted into the lower-middle region of vertebrae. In our novel homogeneous model, the region around approximately twice the diameter of the screw was used as a bone material reference volume. Subsequently, the overall material property of this region was homogeneously attributed to the entire vertebra, and pull-out simulations were conducted.

Results: The mean error of the predicted pull-out forces by our novel homogenous simulations was ~ 7.9% with respect to our heterogeneous model. When solely the cancellous bone was involved during the pull-out process (i.e., for L1, L2, and L3 vertebral bodies whose cortical bone in the inferior region is thin), the novel homogenous model yielded small mean error of < 6.0%. This error, however, increased to ~ 11% when the screw got involved to the cortical bone (for L4 and L5 vertebrae whose cortical bone in the inferior region is thick).

Conclusion: The proposed personalized CT-based homogenous model was highly accurate in estimating the pull-out force especially when only the cancellous bone was involved with the screw.

预测松质骨螺钉拔出强度的新型个性化同质有限元模型。
背景:骨科手术通常需要为各种固定系统插入骨螺钉。术后螺钉松动的风险通常通过螺钉拔出强度的实验或有限元(FE)评估来进行评估。有限元模拟是基于个性化的复杂但精确的异质建模或非个性化的简单但精确度相对较低的同质建模。本研究旨在开发和验证一种新型的基于计算机断层扫描(CT)的个性化同质 FE 模拟方法,以预测松质骨螺钉的拔出力:对 L1-L5 椎体螺钉拔出试验进行了 20 次有限元模拟,即 10 次异质模型和 10 次同质模型。螺钉插入椎体的中下部。在我们的新型均质模型中,螺钉直径两倍左右的区域被用作骨材料参考体积。随后,将这一区域的整体材料属性均匀地归因于整个椎体,并进行拉出模拟:结果:与异质模型相比,我们的新型同质模拟预测拉拔力的平均误差约为 7.9%。当拉出过程中仅涉及松质骨时(即 L1、L2 和 L3 椎体,其下部皮质骨较薄),新型同质模型得出的结论平均误差较小:所提出的基于 CT 的个性化同质模型在估算拔出力方面具有很高的准确性,尤其是当螺钉仅涉及松质骨时。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.10
自引率
7.70%
发文量
494
审稿时长
>12 weeks
期刊介绍: Journal of Orthopaedic Surgery and Research is an open access journal that encompasses all aspects of clinical and basic research studies related to musculoskeletal issues. Orthopaedic research is conducted at clinical and basic science levels. With the advancement of new technologies and the increasing expectation and demand from doctors and patients, we are witnessing an enormous growth in clinical orthopaedic research, particularly in the fields of traumatology, spinal surgery, joint replacement, sports medicine, musculoskeletal tumour management, hand microsurgery, foot and ankle surgery, paediatric orthopaedic, and orthopaedic rehabilitation. The involvement of basic science ranges from molecular, cellular, structural and functional perspectives to tissue engineering, gait analysis, automation and robotic surgery. Implant and biomaterial designs are new disciplines that complement clinical applications. JOSR encourages the publication of multidisciplinary research with collaboration amongst clinicians and scientists from different disciplines, which will be the trend in the coming decades.
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