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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Impaction allografting--the effect of impaction force and alternative compaction methods on the mechanical characteristics of the graft.
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Impaction allografting--the effect of impaction force and alternative compaction methods on the mechanical characteristics of the graft.

机译：冲击同种异体移植-冲击力和替代压紧方法对移植物力学性能的影响。

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Revision total hip replacement with impaction allografting has an attractive potential for restoring bone stock, however, fractures and implant migration remain problematic. Postoperative graft deformation is believed to contribute to migration. Under compressive loading, the fluid in the graft takes up the load initially through fluid pressure that dissipates over time. Given the short duration of an impaction, we proposed two novel graft compaction techniques that allow more time for fluid flow: holding a compression force constant for 90 s (creep technique), and cycles of compressing the graft to a given force and then holding the displacement constant (cyclic relaxation technique). This study examined the effect of the impaction force on the density and mechanical characteristics of the graft, and explored the potential benefit of the proposed alternative compaction techniques. Increasing the impaction force from "low" to high strength increases of 93 and 164%, respectively. The creep technique improved the stiffness and shear strength by 14 and 16%, respectively, when compared with impaction, while the cyclic relaxation technique did not improve the mechanical properties. Although the creep technique could potentially provide a lower risk of intraoperative fracture over the use of larger impaction forces, any clinical benefit of the creep technique warrants further investigation. Our results point to the importance of maximizing impaction forces in impaction allografting surgery.
机译：用撞击同种异体修复全髋关节置换具有恢复骨储备的诱人潜力，但是，骨折和植入物迁移仍然存在问题。术后移植物变形被认为有助于迁移。在压缩载荷下，移植物中的流体最初通过随时间消散的流体压力承担载荷。考虑到撞击的持续时间很短，我们提出了两种新颖的移植物压实技术，这些技术可让更多的时间流过流体：将压缩力保持恒定90 s（蠕变技术），以及将移植物压缩到给定力然后保持压力的周期。位移常数（循环松弛技术）。这项研究检查了冲击力对移植物密度和机械特性的影响，并探讨了所提出的替代压实技术的潜在益处。将冲击力从“低”强度增加到高强度分别增加了93％和164％。与冲击相比，蠕变技术分别将刚度和剪切强度提高了14％和16％，而循环松弛技术并没有改善机械性能。尽管蠕变技术可能会比使用较大的冲击力降低术中骨折的风险，但蠕变技术的任何临床益处都值得进一步研究。我们的研究结果表明，在同种异体移植手术中，最大程度地增加冲击力的重要性。

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