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首页> 外文期刊>Injury >Biomechanical testing to evaluate the cut-through resistance of intramedullary nails for the proximal humerus
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Biomechanical testing to evaluate the cut-through resistance of intramedullary nails for the proximal humerus

机译：生物力学测试，评估肱骨近端髓内钉的抗穿透性

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摘要

Intramedullary nailing for stabilization of proximal humeral fractures is well-established. Complications as part of a cut-through, such as backing out of locking screws, loss of reduction, and perforation of the screws into the glenoid, are equally well-known. The test bench presented in this study enables testing of the cut-through behavior of multiple intramedullary implants on a simulated osteoporotic three-part fracture configuration with three different loading circumstances (A, B and C). In situation A, the glenohumeral dynamic force with progressive loadings entered at an angle of 15 degrees to the humeral shaft. In situation B the force entered at an angle of 35 degrees and in situation C the angle measured 55 degrees. Three different types of nails were tested: the Targon PH with the optimal proximal screw length (T) and with all four proximal screws shortened (Tshort), the Synthes MultiLoc PHN with (S5) and without (S4) the additional calcar screw and, lastly, the PolyAxNail PH, a polyaxial intramedullary nail, in a neutral screwconfiguration (PAN) and a version with diametrically opposed crossed first and fourth locking screws (PAN10).
机译：稳定近端肱骨骨折的髓内钉固定方法已广为人知。同样众所周知的是切开操作中的并发症，例如从锁紧螺钉上退下，复位损失和螺钉穿入关节盂。本研究中提供的测试台能够在具有三种不同加载情况（A，B和C）的模拟骨质疏松三部分骨折结构上测试多个髓内植入物的贯穿行为。在情况A中，渐进载荷下的肱肱动力与肱骨干成15度角。在情况B中，力以35度角进入，在情况C中，该角为55度。测试了三种不同类型的钉子：具有最佳近端螺钉长度（T）且所有四个近端螺钉都缩短了（Tshort）的Targon PH，带有（S5）和不带有（S4）的Synthes MultiLoc PHN，以及额外的骨钉，以及最后，PolyAxNail PH，一种中性螺钉配置（PAN）的多轴髓内钉，以及带有直径相对的交叉第一和第四锁定螺钉（PAN10）的版本。

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