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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >The effect of the screw pull-out rate on cortical screw purchase in unreamed and reamed synthetic long bones
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The effect of the screw pull-out rate on cortical screw purchase in unreamed and reamed synthetic long bones

机译：螺钉拔出率对未扩孔和扩孔的合成长骨的皮质螺钉购买的影响

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摘要

Orthopaedic fracture fixation constructs are typically mounted on to human long bones using cortical screws. Biomechanical studies are increasingly employing commercially available synthetic bones. The aim of this investigation was to examine the effect of the screw pull-out rate and canal reaming on the cortical bone screw purchase strength in synthetic bone. Cylinders made of synthetic material were used to simulate unreamed (foam-filled) and reamed (hollow) human long bone with an outer diameter of 35 mm and a cortex wall thickness of 4 mm. The unreamed and reamed cylinders each had 56 sites along their lengths into which orthopaedic cortical bone screws (major diameter, 3.5 mm) were inserted to engage both cortices. The 16 test groups (n = 7 screw sites per group) had screws extracted at rates of 1 mm/min, 5mm/min, 10mm/min, 20mm/min, 30mm/min, 40mm/min, 50mm/min, and 60 mm/min. The failure force and failure stress increased and were highly linearly correlated with pull-out rate for reamed (R~2 = 0.60 and 0.60), but not for unreamed (R~2 = 0.00 and 0.00) specimens. The failure displacement and failure energy were relatively unchanged with pull-out rate, yielding low coefficients for unreamed (R~2 = 0.25 and 0.00) and reamed (R~2 = 0.27 and 0.00) groups. Unreamed versus reamed specimens were statistically different for failure force (p = 0.000) and stress (p = 0.000), but not for failure displacement (p = 0.297) and energy (0.054 < p < 1.000). This is the first study to perform an extensive investigation of the screw pull-out rate in unreamed and reamed synthetic long bone.
机译：骨科骨折固定结构通常使用皮质螺钉固定在人的长骨上。生物力学研究越来越多地使用可商购的合成骨。这项研究的目的是检查螺钉拔出率和管扩孔对合成骨中皮质骨螺钉购买强度的影响。使用合成材料制成的圆柱体模拟外径为35 mm，皮质壁厚为4 mm的未扩孔（泡沫填充）和扩孔（空心）人类长骨。未扩孔和扩孔的圆柱体沿其长度各有56个位置，其中将矫形皮质骨螺钉（大直径，3.5 mm）插入其中以接合两个皮质。 16个测试组（每组n = 7个螺钉位）以1 mm / min，5mm / min，10mm / min，20mm / min，30mm / min，40mm / min，50mm / min和60的速率拔出螺钉毫米/分钟扩孔试样（R〜2 = 0.60和0.60）的破坏力和破坏应力增加，并且与拔出率高度线性相关，而未扩孔试样（R〜2 = 0.00和0.00）则没有。失效位移和失效能量在拔出率方面相对不变，未扩孔组（R〜2 = 0.25和0.00）和扩孔组（R〜2 = 0.27和0.00）的系数较低。未扩孔试样和扩孔试样的破坏力（p = 0.000）和应力（p = 0.000）在统计学上不同，但破坏位移（p = 0.297）和能量（0.054 <1.000）没有统计学差异。这是首次对未扩孔和扩孔的合成长骨螺钉的拔出率进行广泛研究的研究。

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