Objective 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.

Study Design 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.

Results The LCP was stiffer than the NHTP in all three planes of bending and torsion (p < 0.05). The NHTP had greater strain than the LCP during compression bending and torsion at all ROI (p < 0.0005). The short working length was stiffer in all three planes of bending and in torsion (p < 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.

Conclusion 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.

目的 本研究在一个简单的横向近关节骨折模型中比较了 2.0 mm 锁定压缩缺口头 T 形钢板 (NHTP) 和 2.0 mm 直锁定压缩钢板 (LCP) 的生物力学特性。

研究设计 对 NHTP 和 LCP 的两种不同螺杆配置进行了比较，建模短（配置 1）和长工作长度（配置 2）。对结构进行了压缩、垂直和拉伸无损四点弯曲和扭转测试。使用三维数字图像相关性在 12 个感兴趣区域 (ROI) 处测量板表面应变。比较每个板内部和之间的螺钉配置之间的刚度和应变。

结果 LCP 在所有三个弯曲和扭转平面中都比 NHTP 更硬 ( p  < 0.05)。在所有 ROI ( p  < 0.0005) 的压缩弯曲和扭转过程中，NHTP 具有比 LCP 更大的应变。在所有三个弯曲和扭转平面（p  < 0.05）中，短工作长度比两个板的较长工作长度更硬。在大多数 ROI 下，长工作长度比短工作长度显示出更大的应变。

结论 在该实验模型中，与短骨折块中具有三个螺钉的 2.0 mm NHTP 相比，在短骨折块中装有两个螺钉的 2.0 mm LCP 明显更硬并且具有更低的钢板应变。延长工作长度会显着降低结构刚度并增加板应变。这些发现可以指导结构选择。