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首页> 外文期刊>Journal of Biomechanics >Novel model to analyze the effect of a large compressive follower pre-load on range of motions in a lumbar spine.
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Novel model to analyze the effect of a large compressive follower pre-load on range of motions in a lumbar spine.

机译：一种新型模型，用于分析大型压缩跟随器预紧力对腰椎运动范围的影响。

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摘要

A 3-D finite element model (FEM) of the lumbar spine (L1-S1) was used to determine the effect of a large compressive follower pre-load on range of motions (ROM) in all three planes. The follower load modeled in the FEM produced minimal vertebral rotations in all the three planes. The model was validated by comparing the disc compression at all levels in the lumbar spine with the corresponding results obtained by compressing 10 cadevaric lumbar spines (L1-S1) using the follower load technique described by Patwardhan et al. [1999. A follower load increases the load-carrying capacity of the lumbar spine in compression. Spine 24(10), 1003-1009]. Further validation of the model was performed by comparing the lateral bending and torsion response without pre-load and the flexion-extension response without pre-load and with an 800 N follower pre-load with those obtained using cadaver lumbar spines. Following validation, the FEM was subjected to bending moments in all three planes with and without compressive follower pre-loads of up to 1200 N. Disc compression values and the flexion-extension range of motion under 800 N follower pre-load predicted by the FEM compared well with in vitro results. The current model showed that compressive follower pre-load decreased total as well as segmental ROM in flexion-extension by up to 18%, lateral bending by up to 42%, and torsion by up to 26%.
机译：腰椎（L1-S1）的3-D有限元模型（FEM）用于确定大的压缩跟随器预紧力对所有三个平面中运动范围（ROM）的影响。在FEM中建模的从动载荷在所有三个平面上产生最小的椎骨旋转。通过比较腰椎各个层面的椎间盘压迫与使用Patwardhan等人描述的跟随负荷技术压迫10个腰椎腰椎（L1-S1）所获得的相应结果，对模型进行了验证。 [1999。从动负荷增加了压缩时腰椎的负荷能力。脊柱24（10），1003-1009]。通过比较无预紧力时的侧向弯曲和扭转响应以及无预紧力和800 N随动件预紧力时的屈伸响应与使用尸体腰椎棘突时的弯曲和扭转响应，对模型进行进一步验证。验证之后，在有和没有高达1200 N的从动预紧力的情况下，FEM在所有三个平面上均承受弯曲力矩。FEM预测在800 N随动件预紧力下的椎间盘压缩值和运动的屈伸范围与体外结果比较好。当前模型显示，压迫跟随者的预紧力使总和部分ROM的屈伸率降低了18％，横向弯曲降低了42％，扭转降低了26％。

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