College of Veterinary Medicine, Murdoch University, Perth, Australia.
Department of Medical Engineering and Physics, Royal Perth Hospital, Perth, Australia.
Vet Comp Orthop Traumatol. 2021 May;34(3):161-170. doi: 10.1055/s-0040-1719166. Epub 2020 Nov 29.
This investigation compared the biomechanical properties of a 2.0 mm locking compression notched head T-plate (NHTP) and 2.0 mm straight locking compression plate (LCP), in a simple transverse juxta-articular fracture model.
Two different screw configurations were compared for the NHTP and LCP, modelling short (configuration 1) and long working length (configuration 2). Constructs were tested in compression, perpendicular and tension non-destructive four point bending and torsion. Plate surface strain was measured at 12 regions of interest (ROI) using three-dimensional digital image correlation. Stiffness and strain were compared between screw configurations within and between each plate.
The LCP was stiffer than the NHTP in all three planes of bending and torsion ( < 0.05). The NHTP had greater strain than the LCP during compression bending and torsion at all ROI ( < 0.0005). The short working length was stiffer in all three planes of bending and in torsion ( < 0.05) than the longer working length for both plates. The long working length showed greater strain than the short working length at most ROI.
In this experimental model, a 2.0 mm LCP with two screws in the short fragment was significantly stiffer and had lower plate strain than a 2.0 mm NHTP with three screws in the short fragment. Extending the working length significantly reduced construct stiffness and increased plate strain. These findings may guide construct selection.
本研究比较了 2.0mm 锁定加压开缝钛板（NHTP）和 2.0mm 直型锁定加压钢板（LCP）在简单的关节旁横形骨折模型中的生物力学性能。
比较了 NHTP 和 LCP 的两种不同螺钉构型，分别模拟短（构型 1）和长工作长度（构型 2）。在压缩、垂直和张力非破坏性四点弯曲和扭转下对构建体进行测试。使用三维数字图像相关技术，在 12 个感兴趣区域（ROI）测量板表面应变。在每个板内和板间比较了螺钉构型之间的刚度和应变。
在所有三个弯曲和扭转平面上，LCP 均比 NHTP 更刚硬（<0.05）。在压缩弯曲和扭转过程中，NHTP 在所有 ROI 的应变都比 LCP 大（<0.0005）。对于两种钢板，短工作长度在所有三个弯曲平面和扭转中均比长工作长度更刚硬（<0.05）。在大多数 ROI，长工作长度的应变都比短工作长度大。
在这个实验模型中，与 2.0mm NHTP 的三个短节段螺钉相比，两个螺钉的 2.0mm LCP 在短节段具有更高的刚度和更低的板应变。延长工作长度会显著降低构建体的刚度并增加板的应变。这些发现可能有助于指导构建体的选择。
