四个Roussouly矢状位腰椎对椎间盘不同部位退变的生物力学响应:有限元模型分析

IF 5.6 4区 医学 Q1 ENGINEERING, BIOMEDICAL
Irbm Pub Date : 2023-08-01 DOI:10.1016/j.irbm.2023.100772
W. Wang , F. Pan , P. Wang , W. Wang , Y. Wang , C. Kong , S. Lu
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引用次数: 1

摘要

背景随着年龄的增长,脊柱退行性变通常伴有过度后凸和腰痛,但对腰椎矢状面形态与其退行性生物力学之间的联系知之甚少。本研究基于三维有限元(FE)模型,研究了四个Roussouly矢状排列腰椎对椎间盘各部位退变的生物力学反应。方法采用Roussouly型参数有限元模型,假设简并核(NP)、纤维环基质(AFM)和胶原纤维的材料性质为完整IVD的一半。施加跟随器预载和垂直力来模拟物理站姿。结果NP和AFM强度的降低导致腰椎前屈增加,而纤维力学性能对其影响不大。当面临IVD退变时,1型腰椎在L1-2和L4-S1节段表现出椎间盘内压力和纤维应力增加。在模型中,2型腰椎表现出最高的腰椎前屈和骨盆向后旋转,以及增加的IDP。3型腰椎生物力学稳定性最好。4型腰椎的AFM应力较高,但IDP较低。结论sIVD变性通过增加腰椎前屈运动(即前凸消失)和骨盆后仰旋转而产生矢状位失衡。四种Roussouly腰椎类型的生物力学反应在椎间旋转和应力分布方面存在差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Biomechanical Response of Four Roussouly's Sagittal Alignment Lumbar to Degeneration of Different Parts of Intervertebral Disc: Finite Element Model Analysis

Biomechanical Response of Four Roussouly's Sagittal Alignment Lumbar to Degeneration of Different Parts of Intervertebral Disc: Finite Element Model Analysis

Background

Spinal degeneration with age is commonly accompanied by excessive kyphosis and low-back pain, however, little is known about the connection between lumbar sagittal morphology and its degenerative biomechanics. This study investigates the biomechanical response of four Roussouly's sagittal alignment lumbar to degeneration of various parts of the intervertebral disc (IVD) based on threedimensional finite element (FE) models.

Methods

Using Roussouly's type parametric FE models, material properties of the degenerate nucleus populous (NP), annulus fibrosis matrix (AFM), and collagen fibers were assumed to be half of the intact IVD. A follower preload and vertical force were applied to simulate physical standing posture.

Results

the reduced strength of the NP and AFM led to the increase of lumbar anteflexion, while the fiber mechanical properties have little effect on it. When facing IVD degeneration, Type 1 lumbar showed increased intradiscal pressures (IDPs) and fiber stress at the L1-2 and L4-S1 segments. Type 2 lumbar exhibited the highest lumbar anteflexion and pelvic rearward rotation, as well as increased IDPs among the models. Type 3 lumbar had the best biomechanical stability. Type 4 lumbar showed the higher AFM stress but the lower IDPs among the four types.

Conclusions

IVD degeneration generated sagittal imbalance by increasing lumbar anteflexion movement (i.e., loss lordosis) and pelvic rearback rotation. The biomechanical response of the four Roussouly's lumbar types differed in intervertebral rotation and stress distribution.

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来源期刊
Irbm
Irbm ENGINEERING, BIOMEDICAL-
CiteScore
10.30
自引率
4.20%
发文量
81
审稿时长
57 days
期刊介绍: IRBM is the journal of the AGBM (Alliance for engineering in Biology an Medicine / Alliance pour le génie biologique et médical) and the SFGBM (BioMedical Engineering French Society / Société française de génie biologique médical) and the AFIB (French Association of Biomedical Engineers / Association française des ingénieurs biomédicaux). As a vehicle of information and knowledge in the field of biomedical technologies, IRBM is devoted to fundamental as well as clinical research. Biomedical engineering and use of new technologies are the cornerstones of IRBM, providing authors and users with the latest information. Its six issues per year propose reviews (state-of-the-art and current knowledge), original articles directed at fundamental research and articles focusing on biomedical engineering. All articles are submitted to peer reviewers acting as guarantors for IRBM''s scientific and medical content. The field covered by IRBM includes all the discipline of Biomedical engineering. Thereby, the type of papers published include those that cover the technological and methodological development in: -Physiological and Biological Signal processing (EEG, MEG, ECG…)- Medical Image processing- Biomechanics- Biomaterials- Medical Physics- Biophysics- Physiological and Biological Sensors- Information technologies in healthcare- Disability research- Computational physiology- …
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