不同直径人皮质骨拉力螺钉的生物力学性能研究

目的；比较三种不同直径人骨拉力螺钉的剪切和扭转性能。方法：新鲜青壮年尸体股骨骨干，经深冻后制成直径为４ｍｍ，５ｍｍ，６ｍｍ的人骨拉力螺钉，在材料试验机上分别对螺钉的光杆部和螺纹部行剪切强度及刚度测试，再行扭转破坏。结果：直径为４ｍｍ，５ｍｍ，６ｍｍ的拉力骨螺钉的光杆部的剪切强度分别是５２６Ｎ，１０３４Ｎ，１４５９Ｎ，其螺纹部的剪切强度分别是２９０Ｎ，５０５Ｎ，９３１Ｎ，同一直径人骨拉力螺钉的光杆部

A BIOMECHANICAL STUDY ON THE PROPERTY OF DIFFERENT DIAMETER CORTICAL PULLING-SCREW OF HUMAN

To compare the cutting and reversing property of there different diameter conicalpulling-screws. Methods: In the material experimental machine, the conical pulling-screws withtheir respective diameter of 4mm, 5mm, 6mm which had been deeply frozen from fresh cadavericfemur shaft of young adult, examine the cutting intensity and rigidity property of the smooth partsof screw and the saw tooth parts seperately, then the reversing and destorying. Rusultf The cuttingintensity of the smooth part of screws were respectively 526N, 1034N, 1459N, and of the saw-toothpart of screws were respectively 290N, 505N, 931N. There marked differences in the cutting intensityand rigidity between the smooth of screw were marked and the saw-tooth part, which are of thesame diameter. The differences were also significant with different diameters. The maximummoments of force among the 4mm-diameter, 5mm-diameter, 6mm-diameter pulling-screw were0.64Nm, 1.59Nm, 2.10Nm respectively.While the moments of force of pulling-screws with differentdiameters were siguificant diferent. Conclusiont The biomechanical property of the pulling-screwswith same diameters is different, and the property of those with different diameter was slgnificantdifferent.