Turk J Med Sci. 2019 Feb 11;49(1):442-448. doi: 10.3906/sag-1806-72.
BACKGROUND/AIM: The aim of this study is to compare the stability and implant stresses of suprapectineal plate with infrapectineal plate in three subconfigurations of the screw types.
The stabilities of different fixation methods were compared by finite element analysis on six models. Three infrapectineal and three suprapectineal models each with locked, unlocked, or combined screws were employed. Three-dimensional finite element stress analysis was performed by using isotropic materials with a load of 2.3 kN applied at standing positions. Motion at the fracture line was measured on four different points located on the pubic and iliac sides of the fracture line.
Infrapectineal plate fixation with unlocked screws was found to be the most stable fixation method with 0.006 mm displacement of fragments in all axes at standing positions. The suprapectineal unlocked method was found to be the most unstable in standing positions with maximum displacement values of 0.46 mm vertical shear movement in the x-axis, –0.14 mm displacement in the y-axis, and –0.33 mm lateral shear in the z-axis.
The infrapectineal unlocked plate supplies the most stable fixation with the least implant stress, contrary to the suprapectineal unlocked plate, which has the lowest stability and highest implant stresses.
背景/目的：本研究旨在比较三种螺钉类型的三种亚构型中耻骨上板与耻骨下板的稳定性和植入物应力。
通过对六个模型进行有限元分析，比较了不同固定方法的稳定性。每个模型都有锁定、非锁定或组合螺钉的耻骨下和耻骨上模型。采用各向同性材料，在站立位置施加 2.3 kN 的载荷进行三维有限元应力分析。在骨折线的耻骨和髂骨侧的四个不同点测量骨折线上的运动。
在站立位置，未锁定螺钉的耻骨下板固定被发现是最稳定的固定方法，所有轴上的碎片位移为 0.006 毫米。在站立位置，耻骨上未锁定方法是最不稳定的，x 轴的最大垂直剪切运动位移值为 0.46 毫米，y 轴的位移值为 0.14 毫米，z 轴的横向剪切为 0.33 毫米。
与耻骨上未锁定板相比，未锁定耻骨板提供了最稳定的固定，而植入物的应力最小，而耻骨上未锁定板的稳定性最低，植入物的应力最高。
