空心钉联合同种异体腓骨内固定治疗中青年 股骨颈骨折生物力学分析
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国家自然科学基金项目(81774339),广东省自然科学基金项目(2015A030310203),广州中医药大学第一附属医院青年科研人才培优项目(2015QN01)


Biomechanical Analysis on Young and Middle-Aged Femoral Neck Fractures Fixed by Intramedullary Fibular Allograft Combined with Cannulated Screw
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    摘要:

    目的 比较空心钉联合同种异体腓骨内固定(改良术式)和单纯行空心钉内固定(传统术式)在治疗中青年PauwelsⅠ、Ⅱ、Ⅲ型股骨颈骨折中的力学稳定性差异。方法 建立传统及改良术式固定的PauwelsⅠ、Ⅱ、Ⅲ型股骨颈骨折模型,分析模型股骨头皮质骨壳负重区、股骨颈骨折端应力分布情况,以及股骨头皮质骨壳与股骨颈骨折面剪应力分布情况,并根据预测数据绘制股骨冠状位最大主应变云图,比较两组股骨颈骨折端位移。结果 股骨头皮质骨壳在S12、S13方向剪应力分布均显示采用改良术式优于或相近于采用传统术式。此外,股骨颈骨折面S12、S23方向剪应力情况亦显示采用改良术式固定优于传统术式。Pauwels Ⅱ、Ⅲ型传统术式固定的股骨颈骨折端位移大于改良术式,其中Pauwels Ⅱ型传统术式固定的位移明显大于改良术式,而PauwelsⅠ型改良术式固定的位移显著大于传统术式。结论 改良术式相对适用于PauwelsⅡ、Ⅲ型中青年股骨颈骨折,而传统术式则适用于PauwelsⅠ型中青年股骨颈骨折。

    Abstract:

    Objective To compare differences in mechanical stability of intramedullary fibular allograft with cannulated screw (modified method) and cannulated screw alone (conventional method) for fixing young and middle-aged Pauwels Ⅰ, Ⅱ, Ⅲ femoral neck fractures. Methods Models of Pauwels Ⅰ, Ⅱ, Ⅲ femoral neck fracture fixed by conventional method and modified method were constructed. Stress distributions on weight-bearing area of the femoral cortical bone shell and the end of femoral neck fracture, as well as shear stress distributions on cortical bone shell of the femoral head and femoral neck fracture surface were analyzed, the maximum principal strain cloud maps of the femur in coronal position were drawn according to the predicted data, and the displacements of femoral neck fracture end between two groups were compared. Results The shear stress distributions on cortical bone shell of the femoral head in two directions (S12, S13) showed that femoral neck fractures fixed by modified method was superior or close to that by conventional method. Besides, the shear stress distributions on fracture surface of the femoral neck in two directions (S12, S23) showed that modified internal fixation was superior to conventional internal fixation. The displacements of femoral neck fracture end in Pauwels Ⅱ and Ⅲ fracture fixed by conventional method were greater than those by modified method and the displacements of Pauwels Ⅱ fracture fixed by conventional method were obviously larger than those of Pauwels Ⅱ fracture fixed by modified method. But Pauwels Ⅰ fracture fixed by modified method showed a larger displacement than that fixed by conventional method. Conclusions Modified method is more suitable for fixing femoral neck fracture with large angles (Pauwels Ⅱ and Ⅲ fracture), and conventional method is more suitable for fixing neck fracture with small angles (Pauwels Ⅰ fracture).

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周驰,陈国铭,黄楚瑶,陈腾宇,刘韵韵,黄睿澜,何伟,吕慧页.空心钉联合同种异体腓骨内固定治疗中青年 股骨颈骨折生物力学分析[J].医用生物力学,2019,34(6):601-607

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  • 收稿日期:2018-10-16
  • 最后修改日期:2018-12-28
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  • 在线发布日期: 2019-12-25
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