據統計有超過八成的成年人發生過背痛，其原因大部分來自腰部的病變，而大多數患者透過醫學的保守治療就可以康復，但少數因神經壓迫的症狀嚴重，有內科的反應，如大小便失禁等，則必須考慮手術治療，手術的方式有很多種，本研究將針對腰椎融合手術輔以椎弓根骨釘固定系統的手術方式來進行分析。
分析的目的為比較手術後肢段的加勁效果對於相鄰段椎間盤的影響，有臨床資料指出在手術後相鄰段椎間盤發生病變的機率有增高的跡象，因此本研究將把焦點放在手術後相鄰段椎間盤在轉角、應力跟應變能上的變化，以期能顯示出植骨融合跟椎弓螺釘在手術後力學上的影響。
而在有限元素模型的建立方面則依照本研究團隊先前所使用的方法，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。

There are about 80% of adult have ever been suffered in back pain; Most of them can be recovered after some conservative treatments. However, few of them would still have to take surgery due to the severe symptoms resulted from the compression to the nerves. There are many tapes of surgery for different etiology, in this study; we will focus on the Posterior Lumbar Interbody Fusion 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. So the purpose of this study is to identify the mean factor affecting the adjacent parts of the fusion segment, it’s could be bone graft fusion or pedicle screw.
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.

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