后侧翼循环负荷在一个新的全肘关节整形手术
Christopher M Gibbs1, Brody Nelson2, Taylor Combs2
1Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA.
Journal of hand surgery global online
|June 16, 2023
概括
这项研究测试了一种全新的肘部关节整形手术.
科学领域:
- 骨科生物力学 骨科生物力学
- 生物材料科学是生物材料的科学.
- 手术植入物设计手术植入物设计
背景情况:
- 整体肘部关节整形术 (TEA) 是一种手术程序,用于更换肘部关节.
- 后侧是TEA的稳定性和功能的关键组成部分.
- 了解TEA组件的机械特性对于改善患者的治疗结果至关重要.
研究的目的:
- 为了评估后侧翼的静态和动态强度,在全新的肘部关节整形设计中.
- 为了评估在循环负荷下后侧的松动阻力.
- 在模拟肘部使用过程中分析腰关节和后面骨关节的力.
主要方法:
- 静态应力分析对三种不同的边缘尺寸进行.
- 故障测试涉及循环加载五个片 (一个中等,四个小) 到10,000个循环或直到故障.
- 计算了安全因素,并监测了植入物失败或松动.
主要成果:
- 静态测试显示,小型,中型和大型轮的安全系数分别为6.6,5.74和4.53.
- 中等侧翼在1万个周期内承受了1000N,然后在23000个周期内失败.
- 在不同的负载条件下,小型片显示出不同的故障点,但没有观察到螺丝松动.
结论:
- 新型全肘关节整形手术设计的后侧显示出足够的强度来承受预期的体内力量.
- 循环负荷和静态强度分析表明,中等尺寸的后侧与小尺寸的侧相比,具有更高的强度.
- 确保体和后侧与聚乙烯磨损部件的安全连接对于这种非机械连接关节整形手术的功能至关重要.
相关概念视频
Residual Stresses in Bending
213
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
213
General Case of Eccentric Axial Loading
219
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
219
Eccentric Axial Loading in a Plane of Symmetry
236
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
236
Eccentric Loading
438
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
438
Residual Stresses in Circular Shafts
202
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
202


