髋臼前柱顺行拉力螺钉置钉参数的研究

目的 测量髋臼前柱顺行拉力螺钉相关的置钉参数，提高顺行拉力螺钉置钉的成功率和准确性。方法 收集2015年8月~2016年4月笔者医院40例成年完整骨盆螺旋CT扫描数据，导入Mimics 15.0重建出骨盆的三维数字模型并在髋臼前柱模拟顺行拉力螺钉置入，测量进钉点、进钉方向、可置入拉力螺钉的最大直径和最大长度。结果 男性进钉点到坐骨大切迹顶点的距离为17.82±3.37mm，到坐骨棘的距离为52.64±4.29mm，进钉方向外倾角为62.18°±4.60°，前倾角为78.14°±3.52°，可置入拉力螺钉的最大直径和最大长度分别为7.80±1.26mm和115.13±5.22mm；女性进钉点到坐骨大切迹顶点的距离为26.31±4.05mm，到坐骨棘的距离为60.11±3.57mm，进钉方向外倾角为75.45°±4.16°，前倾角为69.72°±5.66°，可置入拉力螺钉的最大直径和最大长度分别为5.68±1.13mm和104.37±4.15mm。男女性在进钉点、进钉方向、可置入拉力螺钉的最大直径和最大长度差异均有统计学意义。结论 本研究测得的置钉参数有助于术者避免盲目置钉，提高顺行拉力螺钉置钉的成功率和准确性。

Digital Measure and Analysis of an Antegrade Lag Screw to Fix Acetabular Anterior Column

Objective To measure anatomical parameters for an antegrade lag screw implanted in the anterior column of acetabulum to fix the fractures. Methods Forty CT scan data of the patients hospitalized in our department during August 2015 to April 2016 were collected and imported into Mimics 15.0 to reconstruct digital pelvic model.An virtual cylinder was implanted in the anterior column of acetabulum to simulate an antegrade lag screw and the screw entry point,entry angle the maximum diameter and length were measured and statistically analyzed. Results The entry point was 26.31±4.05mm to apex of greater sciatic notch, 60.11±3.57mm to ischial spine, 62.18°±4.60° in extraversion angulation, 78.14°±3.52° in anteversion angulation, and the maximum diameter and length were 7.80±1.26mm and 115.13±5.22mm in male. The entry point is 17.82±3.37mm to apex of greater sciatic notch,52.64±4.29mm to ischial spine,75.45°±4.16° in extraversion angulation,69.72°±5.66° in anteversion angulation,and the maximum diameter and length are 7.80±1.26mm and 104.37±4.15mm in female.There were significant differences in above parameters between male and female. Conclusion The results of our measurement contribute to improve the success rate and accuracy of implanting an antegrade lag into the anterior column of acetabulum.