Kojima A
Department of Orthopaedic Surgery, Kansai Medical University, Osaka, Japan.
Nihon Seikeigeka Gakkai Zasshi. 1995 Sep;69(9):685-98.
The minute mechanical properties of the tibia fixed by a metal plate and screws were investigated under various simulated loading conditions. The bracing technique and the design of the osteosynthetic plate are discussed based on the measurement results. The specimens were eight dried human tibias. Four different fixation method were employed using an AO plate system, and also using an Eggers plate system. The bending force, torsion force and axial force were applied to the tibia. Deformation in the tibia and/or metal plate was measured using double exposure holographic interferometry. The mechanical properties were estimated from the fringe pattern and from the deformation curve obtained from the reconstruction image of the holographic interferometry. The fixation capability of the plate systems differed according to the direction of the loading. The reconstruction image of the hologram showed that deformation increased mainly in the plate corresponding to the fracture line of the tibia. Screws nearer the fracture line were more important in increasing the fixation capability of the plate. Twisted deformations in the plate were observed under a simple bending force. The new measurement method of holographic interferometry clearly showed the two dimensional bending and the twisted deformation in detail.
在各种模拟加载条件下，对用金属板和螺钉固定的胫骨的微观力学性能进行了研究。基于测量结果，讨论了支撑技术和接骨板的设计。标本为八根干燥的人体胫骨。采用AO接骨板系统以及Eggers接骨板系统，运用了四种不同的固定方法。对胫骨施加弯曲力、扭力和轴向力。使用双曝光全息干涉测量法测量胫骨和/或金属板的变形。根据条纹图案和从全息干涉测量重建图像获得的变形曲线来估计力学性能。接骨板系统的固定能力根据加载方向而有所不同。全息图的重建图像显示，变形主要在与胫骨骨折线相对应的接骨板中增加。靠近骨折线的螺钉对于提高接骨板的固定能力更为重要。在简单弯曲力作用下，观察到接骨板中的扭曲变形。新的全息干涉测量方法清楚地详细显示了二维弯曲和扭曲变形。
