中国组织工程研究 ›› 2025, Vol. 29 ›› Issue (33): 7165-7172.doi: 10.12307/2025.847

• 骨科植入物 orthopedic implant • 上一篇    下一篇

斜外侧腰椎椎间融合侧方钉棒位置对节段活动度、内固定和cage应力的影响

马  涛1,李  星1,韦亚军2,邓俊才2   

  1. 1成都中医药大学临床医学院,四川省成都市   610075;2成都中医药大学附属第三医院(西区)脊柱外科,四川省成都市   611730
  • 收稿日期:2024-07-09 接受日期:2024-09-14 出版日期:2025-11-28 发布日期:2025-04-12
  • 通讯作者: 邓俊才,硕士,副教授,硕士生导师,成都中医药大学附属第三医院(西区)脊柱外科,四川省成都市 611730
  • 作者简介:马涛,男,1998年生,陕西省汉中市人,汉族,成都中医药大学骨科学在读硕士,主要从事脊柱相关疾病的研究。
  • 基金资助:
    四川省中医药管理局科研专项课题面上项目(2023MS031),项目负责人:邓俊才;成都中医药大学“杏林学者”学科人才科研提升计划项目(YYZX2022091),项目负责人:邓俊才

Effects of lateral screw-rod placement positions on segmental range of motion, internal fixation and cage stress during oblique lumber interbody fusion

Ma Tao1, Li Xing1, Wei Yajun2, Deng Juncai2   

  1. 1Clinical Medical College of Chengdu University of TCM, Chengdu 610075, Sichuan Province, China; 2Department of Spinal Surgery, No.3 Affiliated Hospital of Chengdu University of TCM (West District), Chengdu 611730, Sichuan Province, China
  • Received:2024-07-09 Accepted:2024-09-14 Online:2025-11-28 Published:2025-04-12
  • Contact: Deng Juncai, MS, Associate professor, Master’s supervisor, Department of Spinal Surgery, No.3 Affiliated Hospital of Chengdu University of TCM (West District), Chengdu 611730, Sichuan Province, China
  • About author:Ma Tao, Master candidate, Clinical Medical College of Chengdu University of TCM, Chengdu 610075, Sichuan Province, China
  • Supported by:
    Sichuan Provincial Administration of Traditional Chinese Medicine Special Research Project, No. 2023MS031 (to DJC); Chengdu University of Traditional Chinese Medicine “Xinglin Scholar” Discipline Talent Research Promotion Program, No. YYZX2022091 (to DJC)

摘要:


文题释义:

斜外侧腰椎椎间融合:是近年常用的椎间融合术式之一,其通过腰大肌与腹部大血管之间的天然间隙建立通道,在直视下置入融合器,进行腰椎的间接减压与融合,具有手术创伤小、手术时间短、术中出血量少、术后恢复快等优点。
有限元分析:为一种通过计算机建立仿真模型进行生物力学分析的方法,与尸体实验相比具有操作方便、可重复性强等优势,现已广泛应用于脊柱生物力学研究、植入物设计和优化等领域。


背景:斜外侧腰椎椎间融合目前已成为一种成熟的腰椎融合方式,其在同一通道下辅助侧方钉棒固定的方式近年来受到了大家的关注,但目前对于术中侧方钉棒放置的最佳位置没有统一定论,且缺乏相关的生物力学依据。

目的:建立不同的斜外侧腰椎椎间融合联合侧方钉棒固定模型,评估其对腰椎生物力学的影响,为侧方钉棒置入提供一定的生物力学依据。
方法:采用1名健康成人的计算机断层扫描图像,利用Mimics、Geomagic和SolidWorks软件建立L4-L5 单纯斜外侧腰椎椎间融合无内固定模型及不同置钉位置的侧方钉棒固定模型,其中双钉棒固定模型9种、单钉棒固定模型5种。在Ansys workbench软件中分析各模型屈伸、侧弯及旋转工况下的活动度、内固定和cage的应力峰值。

结果与结论:①所有内固定模型的活动度均小于单纯斜外侧腰椎椎间融合无内固定模型;双钉棒与单钉棒均在贴近L4和L5上终板放置时的活动度最小,且前者对活动度的限制更多;②所有内固定模型的cage应力峰值均小于单纯斜外侧腰椎椎间融合无内固定模型;除右旋工况外,双钉棒放置在L4和L5前上、后下时融合器应力最小,与贴近L4下终板和L5上终板放置时相接近;单钉棒则在贴近L4下终板和L5上终板处放置时最小;③在屈伸工况下,双钉棒在贴近L4和L5上终板放置时内固定应力峰值最小;单钉棒则贴近L4下终板和L5上终板放置时最小;④提示侧方钉棒的位置是影响斜外侧腰椎椎间融合生物力学性能的重要因素之一,双钉棒固定的生物力学性能总体优于单钉棒;当双钉棒贴近椎体上终板放置时可以获得最好的生物力学稳定性,一定程度降低螺钉断裂的风险;而当双钉棒放置在上下椎的前上和后下象限或紧邻上下终板时可以极大降低cage沉降的发生率。

https://orcid.org/0009-0009-4456-0775 (马涛) 

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱;骨折;内固定;数字化骨科;组织工程

关键词: 斜外侧腰椎椎间融合, 侧方钉棒, 钉棒位置, 有限元分析, 生物力学

Abstract: BACKGROUND: Oblique lumber interbody fusion has become a mature lumbar fusion method at present, and its method of assisting lateral screw-rod fixation under the same channel has attracted attention in recent years. However, there is currently no consensus on the optimal intraoperative placement of lateral screw-rod, and there is a lack of relevant biomechanical evidence.
OBJECTIVE: To establish various oblique lumber interbody fusion combined with lateral screw-rod fixation models, evaluate their impact on lumbar spine biomechanics, and provide biomechanical foundations for the implantation of lateral screw-rod.
METHODS: Using CT images of a healthy adult, the L4-L5 Stand-Alone oblique lumber interbody fusion model and lateral screw-rod fixation models with different screw placement positions were established by using Mimics, Geomagic and SolidWorks software, including nine double screw-rod fixation models and five single screw-rod fixation models. Ansys Workbench software was employed to analyze the range of motion, peak stress of internal fixation and cage under conditions of flexion, lateral bending, and rotation.
RESULTS AND CONCLUSION: (1) The range of motion of all internal fixation models was less than Stand-Alone oblique lumber interbody fusion model. Both single screw-rod and double screw-rod showed the least range of motion when placed close to the upper endplates of L4 and L5, and the former had more restrictions on the motion. (2) The peak stress of cage in all internal fixation models was lower than Stand-Alone oblique lumber interbody fusion model. Except for right rotation condition, double screw-rod was minimal cage stress when placed anterior superior and posterior inferior quadrants of L4 and L5, which was similar to that when placed proximaly to L4 lower and L5 upper endplates; screw-rod showed minimal stress when placed proximally to L4 lower and L5 upper endplates. (3) Under flexion-extension condition, double rod- screw exhibited minimal internal fixation stress when positioned close to the upper endplates of L4 and L5; single-rod fixation showed minimal stress when placed proximally to L4 lower and L5 upper endplates. (4) It is indicated that the position of lateral screw-rod is one of the important factors that affect the biomechanical properties of oblique lumber interbody fusion, double screw-rod performs better biomechanical properties than single-rod fixation. The best biomechanical stability can be obtained when double screw-rod is placed close to the upper endplate of the vertebral body. The risk of cage subsidence is greatly reduced when the double screw-rod is placed in the anterior superior and posterior inferior quadrants of the upper and lower vertebrae or adjacent to the upper and lower endplates.

Key words: oblique lumber interbody fusion, lateral screw-rod, screw-rod placement, finite element analysis, biomechanics

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