School of Engineering, Liverpool John Moores University, Liverpool L3 3AF, UK.
Int Orthop. 2010 Jun;34(5):669-76. doi: 10.1007/s00264-009-0856-4. Epub 2009 Aug 15.
Metatarsal fracture is one of the most common foot injuries, particularly in athletes and soldiers, and is often associated with landing in inversion. An improved understanding of deformation of the metatarsals under inversion landing conditions is essential in the diagnosis and prevention of metatarsal injuries. In this work, a detailed three-dimensional (3D) finite element foot model was developed to investigate the effect of inversion positions on stress distribution and concentration within the metatarsals. The predicted plantar pressure distribution showed good agreement with data from controlled biomechanical tests. The deformation and stresses of the metatarsals during landing at different inversion angles (normal landing, 10 degree inversion and 20 degree inversion angles) were comparatively studied. The results showed that in the lateral metatarsals stress increased while in the medial metatarsals stress decreased with the angle of inversion. The peak stress point was found to be near the proximal part of the fifth metatarsal, which corresponds with reported clinical observations of metatarsal injuries.
跖骨骨折是最常见的足部损伤之一，特别是在运动员和士兵中，通常与足内翻着地有关。深入了解跖骨在足内翻着地条件下的变形情况对于跖骨损伤的诊断和预防至关重要。在这项工作中，开发了一个详细的三维（3D）有限元足部模型，以研究足内翻位置对跖骨内部应力分布和集中的影响。预测的足底压力分布与受控生物力学测试的数据吻合较好。比较研究了在不同足内翻角度（正常着地、10 度足内翻和 20 度足内翻）下着陆时跖骨的变形和应力。结果表明，在外侧跖骨中，随着足内翻角度的增加，应力增加，而在内侧跖骨中，应力减小。在第五跖骨的近端附近发现了峰值应力点，这与报告的跖骨损伤的临床观察结果一致。
