Cui Yunwei, Ding Kai, Lv Hongzhi, Cheng Xiaodong, Fan Zixi, Sun Dacheng, Zhang Yifan, Chen Wei, Zhang Yingze
Department of orthopaedic surgery, Hebei Orthopaedic Clinical Research Center, Hebei Medical University Third Hospital, Shijiazhuang, China.
Key Laboratory of Biomechanics of Hebei Province, Orthopaedic Research Institute of Hebei Province, Shijiazhuang, China.
Front Bioeng Biotechnol. 2024 Aug 30;12:1448527. doi: 10.3389/fbioe.2024.1448527. eCollection 2024.
The magnesium alloy bionic cannulated screw (MABCS) was designed in a previous study promoting cortical-cancellous biphasic healing of femoral neck fractures. The main purpose was to analyze the bore diameters that satisfy the torsion standards and further analyze the optimal pore and implantation direction for stabilizing femoral neck fractures.
The MABCS design with bionic holes with a screw diameter of less than 20% met the torsion standard for metal screws. The MABCS was utilized to repair the femoral neck fracture via Abaqus 6.14 software, which simulated the various stages of fracture healing to identify the optimal biomechanical environment for bionic hole size (5%, 10%, 15%, and 20%) and implantation direction (0°, 45°, 90°, and 135°).
The stress distribution of the MABCS fracture fixation model is significantly improved with an implantation orientation of 90°. The MABCS with a bionic hole and a screw diameter of 10% provides optimal stress distribution compared with the bionic cannulated screw with diameters of 5%, 15%, and 20%. In addition, the cannulated screw fixation model with a 10% bionic hole size has optimal bone stress distribution and better internal fixation than the MABCS fixation models with 5%, 15%, and 20% screw diameters.
In summary, the MABCS with 10% screw diameter bionic holes has favorable biomechanical characteristics for stabilizing femoral neck fractures. This study provides a biomechanical foundation for further optimization of the bionic cannulated screw.
在先前的一项研究中设计了镁合金仿生空心螺钉（MABCS），以促进股骨颈骨折的皮质-松质双相愈合。主要目的是分析满足扭转标准的孔径，并进一步分析稳定股骨颈骨折的最佳孔隙和植入方向。
仿生孔设计且螺钉直径小于20%的MABCS符合金属螺钉的扭转标准。利用MABCS通过Abaqus 6.14软件修复股骨颈骨折，该软件模拟骨折愈合的各个阶段，以确定仿生孔尺寸（5%、10%、15%和20%）和植入方向（0°、45°、90°和135°）的最佳生物力学环境。
植入方向为90°时，MABCS骨折固定模型的应力分布显著改善。与直径为5%、15%和20%的仿生空心螺钉相比，具有10%仿生孔且螺钉直径的MABCS提供了最佳应力分布。此外，仿生孔尺寸为10%的空心螺钉固定模型具有最佳的骨应力分布，并且比螺钉直径为5%、15%和20%的MABCS固定模型具有更好的内固定效果。
综上所述，具有10%螺钉直径仿生孔的MABCS在稳定股骨颈骨折方面具有良好的生物力学特性。本研究为进一步优化仿生空心螺钉提供了生物力学基础。
