腰椎后路关节突横突间植骨融合块的宽度对内固定及邻近节段应力影响的有限元研究

Finite Element Analysis Of The Effect Of Posterior Lumbar Facet Intertransverse Fusion Block Width On The Internal Fixation And The Adjacent Segments

目的建立四种不同宽度(5mm、10mm、15mm、20mm)的关节突横突间植骨融合块的模型,并比对内固定及邻近节段应力的变化。方法螺旋CT扫描后并对图像行预处理,利用Mimics、Solid Works及Hyper Mesh软件建立4种不同植骨植骨宽度的有限元模型,并用ABAQUS有限元处理软件进行有限元运算。结果负重载荷下各种工况中四种不同宽度植骨块的内固定应力最大的是5mm植骨块模型,应力最小的是20mm植骨块模型。负重载荷下各种工况中四种不同宽度植骨块的邻近间盘应力最小的是5mm植骨块模型的L3-4间隙,应力最大的是20mm植骨块模型的L3-4间隙。L5/S1间隙在各种不同宽度植骨块模型中的应力是相差无几的。结论腰椎后路关节突横突间植骨融合块随着宽度的增加,内固定所受应力逐渐减小。腰椎后路关节突横突间植骨融合块随着宽度的增大,对邻近上位节段的应力逐渐增大,对邻近下位节段应力影响无差别。

Objective Four facet intertransverse fusion model withdifferent width （Smm, 10ram, 15ram, 20mm） were estab- lished, and thestress changes of internal fixation and adjacent segment were compared. Methods CT, SolidWorks and HyperMesh were used to establish the finite element model of four kinds of different bone width, and the finite element method was used to deal with Mimics. Results Undervarious loading work conditions, thelargest internal fixation stress of the four kinds of different width was the 5mm bone graft model, and the smallest stress was the 20mm bone graft model. In various operating conditions, four kinds of differ- ent width of the different width of the bone graft is the minimum of the 5ram bone graft model of the L3-4 gap, the maximum stress is 20mm bone graft model of the L3 -4 gap. L5/S1 clearance in different planting width of stress fracture model is not much difference be- tween the. Conclusion Posterior lumbar facet intertransverse fusion block with the width increases, fixation stress decreases gradually. Lumbar posterior articular process of transverse process bone graft fusion block with the increase of the width, the adjacent superior segment stress increases gradually, adjacent inferior segment stress had no effect on the difference.