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| Finite element analysis of proximal femoral nail anti-rotation in the treatment of non-anatomical reduction of basicervical femoral neck fracture in elderly |
| TU Shijie1 ZOU Yang1 XIONG Zhaoping1 CHEN Xinmin2▲ LIN Ziling2 ZOU Xia1 |
1.Department of Traumatic Orthopedics, Fengcheng Hospital of Traditional Chinese Medicine, Jiangxi Province, Fengcheng 331100, China;
2.Department of Traumatic Orthopedics, the First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangdong Province, Guangzhou 510405, China |
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Abstract Objective To investigate the biomechanics of proximal femoral nail anti-rotation in the treatment of femoral neck basicervical fracture in elderly with three different reduction states by using finite element method. Methods Based on the CT data of the volunteers′ hips, the proximal femoral model was extracted and optimized by Mimics, Geomagic and other softwar, then assembled with proximal femoral nail anti-rotation in Solidworks software and segmented into simulated fracture lines. Three models of different reduction states (positive support fracture, neutral support fracture, negative support fracture) were obtained by moving fracture fragments. Finally, all the three models were imported into Abaqus software to set material parameters, boundary conditions, etc., and then the calculation was carried out to check the Von Mises nephogram of the model. Results The stress distribution of the positive support fracture end was the most uniform and the displacement of the fracture end was the least. The stress of negative support fracture end was concentrated and the displacement of the fracture end was the greatest. The stress distribution of neutral support fracture end was uniform and the displacement of the fracture end was larger. Conclusion The use of proximal femoral nail anti-rotation in the treatment of basicervical femoral neck fracture should avoid the negative support reduction state, and try to maintain the anatomical reduction or positive support.
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