Khuri Jane, Wertheimer Stuart, Krueger Jill, Haut Roger
St. John North Shores Hospital, Harrison Township, MI, and Michigan State University, East Lansing, MI, USA.
J Foot Ankle Surg. 2003 Mar-Apr;42(2):63-7. doi: 10.1016/s1067-2516(03)70003-9.
The purpose of this study was to assess 4 methods of fixation for the offset V osteotomy. Maximum load, failure energy, and stiffness were determined in a control group and in 4 different test models. There were 10 specimens for each group. The control group consisted of intact first ray sawbones. An offset V osteotomy was performed on each specimen in each of the 4 test groups. The osteotomies were fixated either with two 2.0-mm cortical screws, two 2.7-mm cortical screws, two 3.5-mm cortical screws, or one 2.7-mm cortical screw and a 0.045-in Kirschner wire, respectively. Each model was then loaded to failure with a computerized hydraulic-tensile testing machine. Results for maximum load to failure for all 4 fixation constructs showed a mean ranging from 113.0 to 144.0 N, a mean energy to failure ranging from 272.2 to 365.0 J, and a mean stiffness ranging from 21.3 to 27.0 N/mm. There were no statistically significant differences detected among the individual constructs. In the group fixated with 3.5-mm screws, there were statistically significant differences in all 3 parameters compared with the control group. In the groups fixated with 2.7-mm screws, 2.0-mm screws, and the 2.7-mm screw and Kirschner wire, there were statistically significant differences in the maximum load and the failure energy, but not in stiffness, when compared with the control group. These findings suggest that all 4 constructs provide similar mechanical properties when utilized for the fixation of the offset V osteotomy.
本研究的目的是评估用于偏置V形截骨术的4种固定方法。在一个对照组和4种不同的测试模型中测定了最大负荷、破坏能量和刚度。每组有10个标本。对照组由完整的第一跖骨锯骨组成。在4个测试组的每个标本上进行偏置V形截骨术。截骨术分别用两枚2.0毫米皮质骨螺钉、两枚2.7毫米皮质骨螺钉、两枚3.5毫米皮质骨螺钉或一枚2.7毫米皮质骨螺钉和一根0.045英寸克氏针固定。然后用计算机控制的液压拉伸试验机对每个模型加载直至破坏。所有4种固定结构的最大破坏负荷结果显示，平均值在113.0至144.0 N之间，平均破坏能量在272.2至365.0 J之间，平均刚度在21.3至27.0 N/mm之间。各结构之间未检测到统计学上的显著差异。在使用3.5毫米螺钉固定的组中，与对照组相比，所有3个参数均有统计学上的显著差异。在使用2.7毫米螺钉、2.0毫米螺钉以及2.7毫米螺钉和克氏针固定的组中，与对照组相比，最大负荷和破坏能量有统计学上的显著差异，但刚度没有。这些发现表明，当用于偏置V形截骨术的固定时，所有4种结构都具有相似的力学性能。
