应力分布在相互锁定和阻断螺丝固定中,用于远距离小腿内甲钉:有限元分析
Gu-Hee Jung1,2, Se-Lin Jeong2, Jungtae Ahn1,2
1Department of Orthopaedic Surgery, Gyeongsang National University, College of Medicine, Gyeongsang National University Changwon Hospital, Samjeongja-ro 1, Seongsan-gu, Changwon-si 51472, Republic of Korea.
三个相互锁定螺丝 (T3S) 与两个相互锁定螺丝 (T2S) 或带有阻塞螺丝的T2S (T2SBS2) 相比,在远端骨骨折中提供更高的结构强度. 这种固定方法优化了应力分布,增强了生物力学稳定性.
科学领域:
- 骨科生物力学 骨科生物力学
- 创伤外科手术中的有限元分析
- 生物材料和植入物设计
背景情况:
- 远距离骨折带来了复杂的固定挑战.
- 内钉固定是一种常见的治疗方法,但螺丝配置会影响结构完整性.
- 了解不同螺杆设置的生物力学性能对于最佳结果至关重要.
研究的目的:
- 通过有限元分析评估和比较各种螺丝配置的结构强度,用于远端骨断裂固定.
- 评估两个互锁螺丝 (T2S),三个互锁螺丝 (T3S) 和两个互锁螺丝和两个阻塞螺丝 (T2SBS2) 的组合在内指甲固定中的生物机械性能.
主要方法:
- 为三个不同的螺丝配置 (T2S,T3S,T2SBS2) 开发有限元模型.
- 基于SAWBONES®模型的材料特性赋值.
- 应用静态轴向 (800 Nm),内部 (3500 Nm) 和外部旋转应力来分析应力分布和结构完整性.
主要成果:
- 三个互锁螺丝 (T3S) 模型在所有负载条件下表现出最低的最大·米塞斯应力 (VMS).
- 与T2S和T2SBS2.2.相比,T3S在轴向 (65.96 MPa) 和内部旋转 (64.86 MPa) 负载时,在中间第一螺丝接触时显示出明显较低的VMS.
- T2SBS2配置有效地降低了远距离互锁螺丝的应力度,表明了改善负载共享的潜力.
结论:
- 初始互锁螺丝的安全固定对于远端骨骨折至关重要.
- 三个互锁螺丝 (T3S) 配置提供了最有利的整体应力分布.
- 结合阻塞螺丝可以减轻距离螺丝部位的应力,提高固定稳定性.
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