在外科手術中，不穩定型骨盆骨折為人體骨折中較不易處理的，此類型骨折常會伴隨骨盆腔內器官受損或失血性休克，而造成較高的發病率與致死率。儘管如此，目前多數骨盆骨折固定系統的生物力學性能，主要仍是根據臨床使用的結果進行評估。而多數臨床研究僅針對單一骨盆骨折固定系統進行評估，僅有少數的研究比較不同骨折固定系統的生物力學性能。因此，本研究的目的是使用有限元法評估不同骨盆骨折固定系統在不同脊椎姿勢的生物力學性能。
在本文中，使用SolidWorks 2015建立三維人體的脊椎-骨盆-股骨骨骼系統，並匯入ANSYS Workbench 17.0進行有限元素模型建立與計算，考量七種類型的脊椎姿勢下，評估的兩類型旋轉不穩定型骨盆骨折之治療策略。
由有限元素分析結果得知，不同脊椎姿勢對術後穩定性，骨應力和植入物應力發揮了重要的影響，在側向壓縮型骨盆骨折使用後方薦髂螺絲固定輔以前方骨板固定，其有良好的生物力學表現，另外針對前後壓縮型骨盆骨折，前方型骨板是較為推薦的固定術。本研究的結果可以直接為外科醫生提供有用的建議，並幫助他們了解骨盆骨折固定系統的生物力學。

In the surgical, unstable pelvic fractures were difficult to handle. This type of fracture often associated with organ damage in the pelvic cavity or hemorrhagic shock and resulted in a higher incidence and mortality. However, the most of biomechanical properties relevant data on pelvic fracture fixation system were mainly based on the results of clinical use. The most clinical studies were evaluated only for a single pelvic fracture fixation system. Only a few studies have compared the biomechanical properties of different fracture fixation systems. Thus, the aim of this study is to evaluate the biomechanical performances of different fixation techniques for unstable pelvic fractures using a finite element model of human pelvic and the effects of different spinal postures.
In this research, it build three-dimensional finite element model of human spine-pelvis-femur skeletal system in SolidWorks 2015, and import to ANSYS Workbench 17.0 for simulation. It assess two types of rotational instability pelvic fractures with different fixation designs, and consider about effect on seven spine postures.
Finite element analysis in this study have resulted seven spine postures, which have an important effect on postoperative stability, bone stress and implant stress. The model that used sacroiliac screws and a locking plate might be recommended for the treatment of Lateral compression pelvic fractures. For Antero-Posterior compression pelvic fractures, the plate located in the lower front of the pelvis was a recommended fixation. The outcome of this study could directly provide the surgical suggestion to orthopedic surgeons and help them to understand the biomechanical of unstable fracture.

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