Rahmatalla A T, Hastings G W, Dove J, Crawshaw A H
Biomedical Engineering Unit, Staffordshire Polytechnic and Stoke on Trent Spinal Service, UK.
J Biomed Eng. 1991 Mar;13(2):97-102. doi: 10.1016/0141-5425(91)90055-c.
Mechanical assessment of a new pedicle screw bridge device for spinal surgery is reported. Results are given for a series of single tests to failure and a fatigue cyclical loading test. Comparative testing of torsional and lateral bending resistance on three surgical spinal fixation systems was carried out: Luque, wired Hartshill rectangle and pedicle screwed bridge with Hartshill rectangle and pedicle screwed bridge with Hartshill rectangle. The results show the superiority of the bridged Hartshill in both rotational and lateral bending resistance. The new bridge device could also improve the versatility of the Hartshill system to cover a wider spectrum of spinal fixations. A test to determine the axial pull-out strength of three screw designs was undertaken. The differences between the forces needed were insignificant. At failure a cylinder of bone tissues greater than the major diameter of the screw was pulled out without breaking the bone.
本文报道了一种用于脊柱手术的新型椎弓根螺钉桥接装置的力学评估。给出了一系列直至失效的单次测试和疲劳循环加载测试的结果。对三种外科脊柱固定系统进行了抗扭转和抗侧弯比较测试：鲁克系统、钢丝哈茨希尔矩形系统以及带有哈茨希尔矩形的椎弓根螺钉桥接系统。结果表明，带桥接的哈茨希尔系统在抗旋转和抗侧弯方面具有优越性。这种新型桥接装置还可以提高哈茨希尔系统的通用性，以涵盖更广泛的脊柱固定范围。进行了一项测试，以确定三种螺钉设计的轴向拔出强度。所需力之间的差异不显著。在失效时，拔出的骨组织圆柱体直径大于螺钉的大径，且未发生骨折。
