腰椎病變是現代人常發生之疾病，少數病人神經壓迫的症狀嚴重，則須考慮手術治療，手術的方式有很多種，本研究將以脊椎改良系統與微創後方腰椎間板間融合術輔以椎弓螺釘固定系統的手術方式來比較脊椎改良系統所能帶來的成效。
近年來，臨床資料指出在傳統腰椎融合手術後相鄰段椎間盤發生病變的機率有增高的跡象，因此本研究研討論脊椎改良系統手術後相鄰段椎間盤在轉角、應力跟應變能相較於傳統腰椎融合手術有何變化，希望能顯示脊椎改良系統在手術後對相鄰段之影響。
有限元素模型的建立則先由電腦斷層掃描(CT)取得DICOM檔，接著由醫學影像軟體3DDoctor處理堆疊成STL檔，再交由MSC.Patran有限前處理軟體建立實體模型，最後由ABAQUS有限元素軟體求解。
分析後可以發現脊椎改良系統可以提升相鄰段之端版轉角和椎間相對轉角，增加腰椎之活動度，且相鄰段之應變能也有減少之趨勢，然而相鄰段之應力減少效果卻十分不一致。因此脊椎改良系統在相鄰段活動度的提升及應變能的減少效果是存在的。

There are many tapes of surgery for different etiology of lumbar vertebra, in this study; we will focus on the evaluation of effect that Dynesys spinal system compares with PLIF surgery implemented with pedicle screw system.
In the recent years, some clinical researches reported that the adjacent parts of fused vertebra segment would degenerate faster due to the much more stiffening of the fusion segment oPLIF surgery. So the purpose of this study is to compare the Dynesys Spinal System compares with PLIF surgery to dentify the mean factor affecting the adjacent parts of the fusion segment.
In the construction of the finite element model, this study use Computer Tomography to export the DICOM file, use 3DDoctor medical software to create the boundary of the vertebral CT slice, and output the surface only file called STL file to MSC.PATRAN, setup the pre-processing step of the finite element analyses in MSC.PATRAN, finally export the input file for ABAQUS to solve the model.
It indicates that the Dynesys Spinal System on the adjacent segment in lumbar spine would raise the rotational displacement and reduce the strain energye, but it shows that the effect of reducing stress for the Dynesys Spinal System is not regular.

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