不同固定方式对股骨颈骨折固定效果的影响
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上海工程技术研究中心资助项目(18DZ2250900)


Influence of Fixation Methods on Fixation Effects of Femoral Neck Fracture
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    摘要:

    目的 研究5种不同空间构型空心螺钉对股骨颈骨折固定效果的影响。方法 将股骨CT图像通过逆向重建获得Pauwels Ⅰ、Ⅱ、Ⅲ型股骨颈骨折几何模型。基于有限元分析软件ANSYS,获取不同内固定方式下内固定物与股骨颈头侧、干侧的应力分布,以及模型的位移分布。结果 对于Pauwels Ⅰ、Ⅱ、Ⅲ型股骨颈骨折,倒三角置钉、两根平行钉、两根平行钉固定方式下股骨颈头侧应力峰值分别最大;倒三角置钉、倒三角置钉、两根平行钉固定方式下股骨颈干侧应力峰值分别最大,交叉置钉固定方式下内固定物应力峰值最小,强斜置钉固定方式下位移峰值最小。结论 交叉置钉的固定方式螺钉变形断裂几率最小,倒三角置钉固定方式可为骨折处提供良好的力学环境。对于Pauwels Ⅰ、Ⅲ型骨折,强斜置钉固定方式预防股骨颈短缩的能力最强;而对于Pauwels Ⅱ型骨折而言,交叉置钉固定方式预防股骨颈短缩的能力最强。

    Abstract:

    Objective To study the influence of hollow screws with five kinds of spatial distributions on the fixation effect of femoral neck fracture. Methods Geometric models of femoral neck fracture with Pauwels type I, II and III were built by reverse engineering according to CT images of the femur. Based on the finite element analysis software ANSYS, the stress distributions of internal fixation, head side and stem side of femoral neck and the displacement distributions of the model fixed by different methods were obtained. Results For femoral neck fracture with Pauwels type I, II and III, the maximum stresses at head side of femoral neck were the inverted triangle fixation method, two-screw parallel fixation method, two-screw parallel fixation method, respectively. The maximum stresses at stem side of femoral neck were the inverted triangle fixation method, inverted triangle fixation method and two-screw parallel fixation method, respectively. The minimum stresses on the screws were the cross fixation method, and the minimum displacements of the model were double-supported fixation method. Conclusions The probability of screw deformation and fracture is the smallest for cross fixation method. Inverted triangle fixation method can provide a good mechanical environment for fracture site. For femoral neck fracture with Pauwels typeⅠ and Ⅲ, double-supported fixation method has the strongest ability to prevent femoral neck shortening. While for femoral neck fracture with Pauwels typeⅡ, cross fixation method has the strongest ability to prevent femoral neck shortening.

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魏文卿,崔海坡,陈舰,程云章,程千莉.不同固定方式对股骨颈骨折固定效果的影响[J].医用生物力学,2020,35(2):216-222

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  • 收稿日期:2018-12-16
  • 最后修改日期:2019-01-17
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  • 在线发布日期: 2020-04-27
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