PDF(Pubmed)
Abstract：
Using a curved carbon-fiber plate (CFP) in running shoes may offer notable performance benefit over flat plates, yet there is a lack of research exploring the influence of CFP geometry on internal foot loading during running. The objective of this study was to investigate the effects of CFP mechanical characteristics on forefoot biomechanics in terms of plantar pressure, bone stress distribution, and contact force transmission during a simulated impact peak moment in forefoot strike running. We employed a finite element model of the foot-shoe system, wherein various CFP configurations, including three stiffnesses (stiff, stiffer, and stiffest) and two shapes (flat plate (FCFP) and curved plate (CCFP)), were integrated into the shoe sole. Comparing the shoes with no CFP (NCFP) to those with CFP, we consistently observed a reduction in peak forefoot plantar pressure with increasing CFP stiffness. This decrease in pressure was even more notable in a CCFP demonstrating a further reduction in peak pressure ranging from 5.51 to 12.62%, compared to FCFP models. Both FCFP and CCFP designs had a negligible impact on reducing the maximum stress experienced by the 2nd and 3rd metatarsals. However, they greatly influenced the stress distribution in other metatarsal bones. These CFP designs seem to optimize the load transfer pathway, enabling a more uniform force transmission by mainly reducing contact force on the medial columns (the first three rays, measuring 0.333 times body weight for FCFP and 0.335 for CCFP in stiffest condition, compared to 0.373 in NCFP). We concluded that employing a curved CFP in running shoes could be more beneficial from an injury prevention perspective by inducing less peak pressure under the metatarsal heads while not worsening their stress state compared to flat plates.
摘要：
在跑鞋中使用弯曲的碳纤维板（CFP）可以提供比平板明显的性能优势，然而，缺乏研究探索CFP几何形状对跑步过程中内部足部负荷的影响。本研究的目的是研究CFP力学特性对足底压力方面前足生物力学的影响，骨应力分布，在前脚撞击跑步中模拟冲击峰值力矩期间，以及接触力传递。我们采用了脚鞋系统的有限元模型，其中各种CFP配置，包括三个刚度(刚度，更硬，和最硬)和两种形状(平板(FCFP)和弯曲板(CCFP))，被整合到鞋底中。将没有CFP（NCFP）的鞋子与有CFP的鞋子进行比较，我们一致观察到随着CFP硬度的增加，前足足底压力峰值降低。在CCFP中，这种压力下降甚至更明显，表明峰值压力进一步降低了5.51％至12.62％。与FCFP模型相比。FCFP和CCFP设计对减少第二和第三meta骨承受的最大应力的影响可忽略不计。然而,它们极大地影响了其他meta骨的应力分布。这些CFP设计似乎优化了负载转移途径，通过主要减少中间柱上的接触力(前三条射线，在最僵硬的情况下，FCFP的体重为0.333倍，CCFP的体重为0.335倍，与NCFP中的0.373相比）。我们得出的结论是，从预防伤害的角度来看，在跑鞋中采用弯曲的CFP可能会更有益，因为与平板相比，在meta骨头下产生较小的峰值压力，而不会恶化其应力状态。
