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首页> 外文期刊>Journal of orthopaedic research >Hip screw migration testing: first results for hip screws and helical blades utilizing a new oscillating test method.
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Hip screw migration testing: first results for hip screws and helical blades utilizing a new oscillating test method.

机译：髋部螺钉移动测试：采用新的振动测试方法获得的髋部螺钉和螺旋叶片的初步结果。

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摘要

Despite continued improvement in the methods and devices used to treat intertrochanteric fractures, there remains an unacceptable amount of failures. The cut-out rate for hip screws has been recorded up to 8.3%. To evaluate the migration of different implants under physiological loads, a multiplanar biomechanical test method for hip screws was developed, the first to incorporate a simulation of the human gait cycle by an oscillating flexion/extension movement of the test device. The new method was used to compare different hip screw and blade designs with respect to their directional migration resistance. The test method generated failure modes that were consistent with those observed clinically. Under cyclic loading, the hip screws migrated predominantly in a cephalad direction. In contrast, the helical blades exhibited a distinct migration in their axial direction. The Gamma3 hip screw design showed a significantly higher migration resistance compared with other screw and helical blade designs. The results demonstrate the ability of hip screws to significantly reduce axial migration and prevent cut-out under simulated walking loads. Further, the new multiplanar test method creates a physiological environment that can be used to optimize designs for intertrochanteric fracture fixation.
机译：尽管用于治疗股骨粗隆间骨折的方法和装置的持续改进，但仍存在无法接受的失败数量。髋部螺钉的切除率最高记录为8.3％。为了评估不同植入物在生理负荷下的迁移，开发了一种用于髋螺钉的多平面生物力学测试方法，该方法首次通过振动/伸展运动测试设备来模拟人的步态周期。该新方法用于比较不同的髋部螺钉和叶片设计的方向迁移阻力。该测试方法产生的失效模式与临床观察到的一致。在循环载荷下，髋部螺钉主要朝头方向移动。相反，螺旋叶片在其轴向方向上表现出明显的迁移。与其他螺钉和螺旋叶片设计相比，Gamma3髋部螺钉设计显示出明显更高的抗迁移性。结果表明，髋部螺钉能够显着减少轴向移动并防止在模拟行走载荷下产生切痕。此外，新的多平面测试方法创建了一种生理环境，可用于优化转子间骨折固定的设计。

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