[Finite element analysis of adding one transverse screw for Pauwels type femoral neck fractures].

Q3 Medicine
Luyao Ma, Xueao Sun, Qingjun Tan, Yanping Lan, Xiaohu Wang, Yunsheng Yin, Jinhui Ma
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引用次数: 0

Abstract

Objective: To investigate whether adding 1 transverse screw (TS) to the triangular parallel cannulated screw (TPCS) fixation has a mechanical stability advantage for Pauwels type Ⅲ femoral neck fractures by conducting finite element analysis on four internal fixation methods.

Methods: Based on CT data of a healthy adult male volunteer's femur, three Pauwels type Ⅲ femoral neck fracture models (Pauwels angle 70°, Pauwels angle 80°, and Pauwels angle 70° combined with bone defect) were constructed using Mimics 21.0 software and SolidWorks 2017 software. Four different internal fixation models were built at the same time, including TPCS, TPCS+TS, three cross screws (TCS), and TPCS+medial buttress plate (MBP). The mechanical stability of different models under the same load was compared by finite element analysis.

Results: The femoral model established in this study exhibited a maximum stress of 28.62 MPa, with relatively higher stress concentrated in the femoral neck. These findings were comparable to previous studies, indicating that the constructed femoral finite element model was correct. The maximum stress of internal fixation in finite element analysis showed that TCS was the lowest and TPCS+MBP was the highest in Pauwels angle 70° and 80° models, while TPCS+TS was the lowest and TCS was the highest in Pauwels angle 70° combined with bone defect model. The maximum displacement of internal fixation in each fracture model was located at the top of the femoral head, with TCS having the highest maximum displacement of the femur. The maximum stress of fracture surface in finite element analysis showed that TCS was the lowest and TPCS was the highest in the Pauwels angle 70° model, while TPCS+MBP was the lowest and TPCS/TCS were the highest in the Pauwels angle 80° model and the Pauwels angle 70° combined with bone defect model, respectively. The maximum displacement of fracture surfece analysis showed that TPCS+MBP was the lowest and TCS was the highest in Pauwels angle 70° and 80° models, while TPCS+TS was the lowest and TCS was the highest in Pauwels angle 70° combined with bone defect model.

Conclusion: For Pauwels type Ⅲ femoral neck fractures, the biomechanical stability of TPCS+TS was superior to that of TPCS alone and TCS, but it has not yet reached the level of TPCS+MBP.

[加1枚横向螺钉治疗Pauwels型Ⅲ股骨颈骨折的有限元分析]。
目的:通过对四种内固定方法的有限元分析,探讨在三角形平行空心螺钉(TPCS)内固定加1根横螺钉(TS)对Pauwels型Ⅲ股骨颈骨折的力学稳定性是否有优势。方法:基于健康成年男性志愿者股骨CT数据,利用Mimics 21.0软件和SolidWorks 2017软件构建3个Pauwels型Ⅲ股骨颈骨折模型(Pauwels角70°、Pauwels角80°和Pauwels角70°合并骨缺损)。同时建立四种不同的内固定模型,包括TPCS、TPCS+TS、三十字螺钉(TCS)和TPCS+内侧支撑板(MBP)。通过有限元分析比较了不同模型在相同荷载作用下的力学稳定性。结果:本研究建立的股骨模型最大应力为28.62 MPa,较高的应力集中在股骨颈。这些结果与以往的研究结果相当,表明所构建的股骨有限元模型是正确的。有限元分析结果显示,70°和80°保韦尔斯角模型内固定最大应力TCS最低,TPCS+MBP最高,70°保韦尔斯角合并骨缺损模型内固定最大应力TPCS+TS最低,TCS最高。各骨折模型内固定最大位移位于股骨头顶部,其中TCS的股骨最大位移最大。有限元分析显示,Pauwels角70°模型中,TCS最小,TPCS最大,而Pauwels角80°模型和Pauwels角70°联合骨缺损模型中,TPCS+MBP最小,TPCS/TCS最大。骨折面最大位移分析显示,在Pauwels角70°和80°模型中,TPCS+MBP最小,TCS最高,而在Pauwels角70°合并骨缺损模型中,TPCS+TS最小,TCS最高。结论:对于Pauwels型Ⅲ股骨颈骨折,TPCS+TS的生物力学稳定性优于单独TPCS和TCS,但尚未达到TPCS+MBP的水平。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
中国修复重建外科杂志
中国修复重建外科杂志 Medicine-Medicine (all)
CiteScore
0.80
自引率
0.00%
发文量
11334
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