Department of Trauma and Reconstructive Surgery, Friederikenstift Hospital Hannover, Humboldtstraße 5, 30169, Hannover, Germany.
Int Orthop. 2013 Apr;37(4):667-72. doi: 10.1007/s00264-013-1779-7. Epub 2013 Jan 29.
A biomechanical study was performed to test the hypothesis that a new anatomically preformed, thinner, soft-tissue protecting plate system for distal humeral fractures (Tifix®-hybridplate [HP]) would show comparable results in the quasi-static and dynamic testings compared to two conventional implants: The 3.5-mm reconstruction plate (RP) providing primary stability with normal bone mineral density (BMD), and a multidirectional locking plate (Tifix(®)-plate [P]) which can be used with poor bone quality.
The Tifix(®)-HP was developed by the working group. The biomechanical testing was performed on a C2-fracture-model in 24 synthetic humeri. Three groups, each with eight bone-implant-constructs, were analysed in quasi-static and dynamic tests.
The quasi-static measurements showed that under extension loading both locking plates (Tifix(®)-P, Tifix(®)-HP) were significantly stiffer than the reconstruction plate, and that the Tifix(®)-HP had a significantly lower stiffness than the two other implants under flexion loading. In the dynamic tests the Tifix(®)-P allowed significantly less fracture motion compared to the Tifix(®)-HP and the reconstruction plate. In an osteopaenic bone model locking plates failed only under much higher dynamic force than the reconstruction plate. The reconstruction plate and the Tifix(®)-P always failed through screw loosening, whereas the newly developed Tifix(®)-HP showed screw loosening in only one third of cases.
The hypothesis that the newly designed plate system showed comparable results in the quasi-static and dynamic tests compared to the conventional implants with a significantly lower implant volume and thickness was confirmed.
进行一项生物力学研究，以验证以下假设：一种新的解剖预成型、更薄、软组织保护板系统（Tifix®-hybridplate [HP]）用于治疗肱骨远端骨折，与两种传统植入物相比，在准静态和动态测试中具有相当的效果，这两种传统植入物是：3.5 毫米重建板（RP），在正常骨矿物质密度（BMD）下提供初步稳定性；多向锁定板（Tifix(®)-plate [P]），可用于骨质量较差的情况。
Tifix(®)-HP 由工作组开发。生物力学测试在 24 个合成肱骨的 C2 骨折模型上进行。在准静态和动态测试中，对三个组（每组 8 个骨-植入物-结构）进行了分析。
准静态测量显示，在伸展加载下，两种锁定板（Tifix(®)-P、Tifix(®)-HP）的刚度明显大于重建板，而在弯曲加载下，Tifix(®)-HP 的刚度明显小于另外两种植入物。在动态测试中，与 Tifix(®)-HP 和重建板相比，Tifix(®)-P 允许骨折运动明显减少。在骨质疏松模型中，锁定板仅在比重建板高得多的动态力下才失效。重建板和 Tifix(®)-P 总是因螺钉松动而失效，而新开发的 Tifix(®)-HP 仅在三分之一的病例中出现螺钉松动。
与具有显著较低植入物体积和厚度的传统植入物相比，新设计的板系统在准静态和动态测试中具有相当的效果的假设得到了证实。
