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首页> 外文期刊>Arabian Journal for Science and Engineering >Biomechanical Study of Fused Lumbar Spine Considering Bone Degeneracy Using FEA
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Biomechanical Study of Fused Lumbar Spine Considering Bone Degeneracy Using FEA

机译：有限元分析的融合性腰椎融合生物力学研究

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摘要

Pedicle screw fixation is a universally accepted technique in the surgical treatment of spinal disorder. The existence of high mechanical stresses on the vertebral body due to loading/bone degeneracy on patients having vertebral implants may result in malfunctioning of the pedicle screws. The present work aims to predict the effect of various pedicle screws used in vertebral implants considering bone degeneracy and to select the screw for improved performance. A three-dimensional (3D) intact and fused model of L2-L3-L4 is generated for biomechanical and FE study. To consider degeneracy, bones were categorized into four groups, i.e., weak bone, normal bone, strong bone and very strong bone. The developed FE model was subjected to various axial compressive loads (270, 330, 450 and 510 N), and pure moment of 10 Nm is applied at the top surface of the L2 vertebra, while the lower surface of the L4 vertebra remains fixed. Three different diameters of the pedicle screw (5.5, 6.0 and 6.5) were considered to identify localized stress generation at bone-screw interface. Results prevail that pedicle screw of 6.0 mm diameter, 45 mm length enables minimum stress distribution at the bone-screw interface considering flexion, extension, bending and twist. The observations and data shown in the results may support researchers and clinical practitioners to identify accurate pedicle screw for vertebral implants so as to minimize screw failure/loosening. The work may help to design new vertebral implants and to identify the after-effects of implantation with varying bone densities.
机译：椎弓根螺钉固定术是脊柱疾病外科治疗中的一种普遍接受的技术。在具有椎骨植入物的患者上，由于负荷/骨骼退化而在椎体上存在高机械应力可能导致椎弓根螺钉发生故障。本工作旨在预测考虑骨退化的椎骨植入物中使用的各种椎弓根螺钉的效果，并选择螺钉以改善性能。生成了L2-L3-L4的三维（3D）完整融合模型，用于生物力学和有限元分析。为了考虑退化，将骨骼分为四类，即，弱骨，正常骨，强骨和非常强骨。发达的有限元模型承受各种轴向压缩载荷（270、330、450和510 N），在L2椎骨的上表面施加10 Nm的纯弯矩，而L4椎骨的下表面保持固定。考虑使用三种不同直径的椎弓根螺钉（5.5、6.0和6.5）来识别骨螺钉界面处的局部应力产生。结果表明，考虑到屈曲，伸展，弯曲和扭曲，直径6.0毫米，长度45毫米的椎弓根螺钉可使应力在骨螺钉界面的分布最小。结果中显示的观察结果和数据可支持研究人员和临床医生为椎骨植入物确定准确的椎弓根螺钉，从而最大程度地减少螺钉失效/松动。这项工作可能有助于设计新的椎骨植入物，并确定具有不同骨密度的植入物的后效应。

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