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研究生(外文):Zheng-Cheng Zhong
論文名稱(外文):Biomechanical Evaluation and Design of the Interbody Fusion Cage in Lumbar Spine
指導教授(外文):Chen-Sheng Chen
外文關鍵詞:fusion cagefinite element methodbiomechanics
  • 被引用被引用:6
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為進行生物力學的分析與設計,本研究透過軟體ANSYS 6.0建構出三度空間腰椎有限元素模型,包括L1椎體到L3椎體,並以拓樸最佳化分析新椎間融合器的外形。而新設計椎間融合器和現有的RF融合器分別被放在L2-L3的運動肢段中,來比較它的生物力學特色,如鄰近椎間盤應力、骨頭與融合器之間的接觸壓力、下陷量、移位量和運動範圍。因此,總計建立出三個模型,包括正常腰椎模型、脊椎植入雙顆RF融合器模型、脊椎植入雙顆新設計融合器模型。而力量的負荷條件是給予10N-m的前彎、後彎、側彎及扭轉力矩於L1椎體上,L3椎體底部所有節點完全固定住。
Degenerative spinal instability was effectively treated by means of improved orthopaedic device in recent years. Spinal deformity imposed from external force such as disc herniation or narrowing was also managed since the cage was developed. The spinal cage aimed to support the vertebral body instead of degenerated disc. However, most of the spinal cages were imported from different countries. The patients in Taiwan must pay more for the health cost to implant the spinal cage for treating degenerative spine. To reduce the health cost, the purposes of this study developed a new cage and evaluate its biomechanical function.
To undergo biomechanical design and analysis, a three-dimensional finite element model (FEM) of the lumbar spine L1-L3 was constructed by a commercial software ANSYS 6.0 and employed the topology optimization to design a new cage. The RF cage and new cage were respectively inserted into FEM of lumbar spine in L2-L3 motion segment for comparing the biomechanical features, such as stress of adjacent disc, contact pressure of interface between cancellous bone and cage, subsidence, dislodgement and range of motion. Therefore, a total of three models, included intact lumbar spine, spine with double RF cages, and spine with double new cages, were established in this study. The loading condition was that the 10 N-m flexion, extension, lateral bending, and torsion were respectively subjected to the L1 vertebral body. The bottom of the L3 vertebral body was completely fixed.
This study indicated that the new cage was able to achieve spinal stability, which the range of motion was reduced from 61% to 82% when comparing with the intact FEM. Volume of the new cage less 36% than RF cage. All of the models with cages had low subsidence and dislodgement, maximally reached 0.089 and 0.215 mm, respectively. As to the adjacent disc, the spine with two RF cages and two new cages also increased stress about 77% than the intact model
in flexion. The stress of new cage was greatest than that of the double RF cages.
This study concluded that the new cage was developed and manufactured to a solid prototype from an engraving machine Modela20. The new cage had comparative features with the current RF cage. Also, the new cage almost had same performance with RF cages such as subsidence, dislodgement, and stress of adjacent disc. Additionally, new cage increased more space to place bone graft, decreased cost of material and had similar stability with current RF cage.
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