This study evaluated the effect of pre-bending dynamic compression plates on fracture site compression. Recommendations of 1 to 2 mm of pre-bend have been proposed, but there does not appear to be experimental data to confirm the optimal pre-bend magnitude. Dynamic compression plating was performed on the lateral convex surface of 18 femoral analogs to fixate a simulated mid-shaft fracture. Plates with 0 mm (flat plate), 1 mm, and 2 mm of pre-bend were evaluated for their production of compression by determining the strain magnitudes for 10 equal-sized zones across the anterior cortex at the osteotomy site using digital imaging correlation. The 0 and 1 mm plates produced significantly more compression at the near cortex (p = 0.001 and p = 0.003, respectively) than the 2 mm plate. However, the 0 and 1 mm plates also created visible diastasis at the far cortex, while the 2 mm plate exhibited compression across all zones. The strain magnitudes for the 0 mm (R2 = 0.62) and 1 mm (R2 = 0.86) plates linearly and significantly decreased from the region adjacent to the plate until a region 50%-60% across the analog diameter. In contrast, the 2 mm plate exhibited uniform strains across the osteotomy site. This study demonstrates that pre-bending a dynamic compression plate 2 mm prior to fixation on a convex lateral femur provides the most compression at the far cortex. It also produces more uniform compression across the fracture when compared to 0 and 1 mm of pre-bend.

中文翻译：

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预弯曲动态压缩板会显着改变股骨中段骨折平面附近的应变分布。

这项研究评估了预弯曲动态压缩板对骨折部位压缩的影响。已经提出了1至2 mm预弯曲的建议，但是似乎没有实验数据可以确定最佳的预弯曲幅度。在18个股骨类似物的侧凸表面上进行动态加压镀敷，以固定模拟的中轴骨折。使用数字成像相关性，通过确定截骨部位前皮质的10个相等大小区域的应变幅度，评估弯曲前0毫米（平板），弯曲1毫米和2毫米的钢板的压缩产生。0 mm和1 mm板在近皮层处产生的压缩明显大于2 mm板（分别为p = 0.001和p = 0.003）。然而，0 mm和1 mm的钢板在远皮层也产生可见的隔骨，而2 mm的钢板则在所有区域均表现出压迫感。0 mm（R2 = 0.62）和1 mm（R2 = 0.86）板的应变幅度从与板相邻的区域线性减小，直到在整个模拟直径范围内达到50％-60％。相反，2 mm的钢板在截骨部位显示出均匀的应变。这项研究表明，将动态加压板预弯曲2毫米，然后再固定在外侧股骨上，可以在远皮层提供最大的加压。与预弯曲0毫米和1毫米相比，它还能在整个骨折上产生更均匀的压缩。86）板块从与板块相邻的区域开始线性且显着减少，直到整个模拟直径的区域达到50％-60％。相反，2 mm的钢板在截骨部位显示出均匀的应变。这项研究表明，将动态加压板预弯曲2毫米，然后再固定在外侧股骨上，可以在远皮层提供最大的加压。与预弯曲0毫米和1毫米相比，它还能在整个骨折上产生更均匀的压缩。86）板块从与板块相邻的区域开始线性且显着减少，直到整个模拟直径区域达到50％-60％。相反，2 mm的钢板在截骨部位显示出均匀的应变。这项研究表明，将动态加压板预弯曲2毫米，然后再固定在外侧股骨上，可以在远皮层提供最大的加压。与预弯曲0毫米和1毫米相比，它还能在整个骨折上产生更均匀的压缩。