BACKGROUND Stable fixation promotes union in the common femoral neck fractures, but high non-union rates due to fixation failure remain with traditional fixations. To enhance stability, a plate interlocking pins, but without further fixation to femur has been developed. To our knowledge, no comparison to other conventional fixation methods has been performed. We tested the hypothesis that the novel implant biomechanically leads to a more stable femoral neck fixation. METHODS Fifty synthetic femurs with a cervical wedge osteotomy were allocated to intervention with three hook-pins interlocked in a plate (Hansson Pinloc® System) or standard fixations with a two-hole Dynamic Hip Screw® plate with an anti-rotational screw, three cannulated screws (ASNIS® III) or two screws (Olmed® or Cannulated Hip Screws®). Quasi-static non-destructive torsion around the neck, anteroposterior bending and vertical compression were tested to detect stiffness. The specimen's deformation was evaluated after cyclic compression simulating weight-bearing. Local deformation of implant channels was measured. Fixation failure was defined by fissure formation. FINDINGS Compared to the conventional implants all together, the interlocked pins enhanced mean stiffness 130% in torsion and 33% in bending (P < 0.001), while compressive stability was increased by a reduced deformation of 62% in average of the global test specimen and 95% decreased local implant channel deformation after cycling (P < 0.001). In comparisons with each of the standard fixations the interlocking pins revealed no signs of adverse effects. INTERPRETATION The novel femoral neck interlocking plate allowed dynamic compression and improved multi-directional stability compared to the traditional fixations.

中文翻译：

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与传统的固定方法相比，新型股骨颈联锁板提高了稳定性。合成骨的生物力学研究。

背景技术稳定的内固定促进了常见股骨颈骨折的愈合，但是传统内固定仍然存在由于固定失败导致的高骨不连率。为了增强稳定性，已经开发了一种板式互锁销，但是没有进一步固定在股骨上。据我们所知，尚未进行与其他常规固定方法的比较。我们测试了这种假体，该假体在生物力学上导致更稳定的股骨颈固定。方法将50例具有颈楔形截骨术的人工股骨用于三个互锁在板中的钩钉（HanssonPinloc®System）或带有防旋转螺钉的两孔Dynamic HipScrew®板的标准固定，三个空心针进行干预。螺钉（ASNIS®III）或两颗螺钉（Olmed®或空心髋臼螺钉®）。测试了颈部周围的准静态无损扭转，前后弯曲和垂直压缩，以检测僵硬程度。在模拟承重的循环压缩之后，评估样品的变形。测量植入物通道的局部变形。固定失败的定义是裂痕形成。研究发现，与常规植入物相比，互锁销的平均刚度提高了130％的扭转刚度和33％的弯曲平均刚度（P <0.001），而压缩稳定性的提高是通过将整体试样平均变形降低了62％来实现的。循环后减少了95％的局部植入物通道变形（P <0.001）。与每个标准固定装置相比，互锁销没有显示出任何不利影响的迹象。