Nie Wen-Zhong, Ye Ming, Wang Zhen-Yu
School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, China.
Biomed Tech (Berl). 2008 Aug;53(4):174-80. doi: 10.1515/BMT.2008.029.
The purpose of this study was to introduce infinite models in scoliosis and to analyze personal experience. Based on a three-dimensional patient-specific finite element model of the spine, rib cage, pelvis and abdomen, a parametric individual model of a thoracolumbosacral orthosis was built. Three standard strap tensions (20, 40, 60 N) were loaded on the back of the brace to simulate the strap tension. The I-Scan distribution pressure measurement system was used to measure the pressure of the different regions and the equivalent forces in these regions were calculated. The spinal curve changes and the forces acted on the brace generated by the strap tension were evaluated and compared with the measurement results. The reduction of the coronal curvature was approximately 60% for a strap tension of 60 N. The sacral slope and the lordosis were partially reduced in this case. The brace modified the axial rotation at the deformed vertebrae. The forces generated in finite element analysis were in good agreement with the measurement. The findings supported the feasibility of such an approach to analyze individual bracing biomechanics, which may be useful in the design of more effective individual braces.
本研究的目的是引入脊柱侧弯的无限模型并分析个人经验。基于脊柱、胸廓、骨盆和腹部的三维患者特异性有限元模型，构建了胸腰骶矫形器的参数化个体模型。在支架背部施加三种标准束带张力（20、40、60 N）以模拟束带张力。使用I-Scan分布压力测量系统测量不同区域的压力，并计算这些区域的等效作用力。评估脊柱曲线变化以及束带张力在支架上产生的作用力，并与测量结果进行比较。对于60 N的束带张力，冠状面曲率的减小约为60%。在这种情况下，骶骨倾斜度和腰椎前凸部分减小。该支架改变了变形椎体处的轴向旋转。有限元分析中产生的力与测量结果吻合良好。这些发现支持了这种分析个体支具生物力学方法的可行性，这可能有助于设计更有效的个性化支具。
